The correct article to complete the sentence is "an." This is because "an" is the indefinite article used before a word that starts with a vowel sound. In this case, the word "elephant" starts with a vowel sound, "e", so "an" should be used.
The article "a" is not correct because it is used before words that start with a consonant sound.
The article "the" is not correct because it is used to indicate a specific noun that is being referred to.
No article is not correct because it is not used before a singular count noun.
Determinative
If you've wondered why grammar books sometimes call the, this, and my "determinatives" and other times "determiners", you've spotted a useful distinction. The two terms aren't synonyms: one names a word class, the other names a job. Once that clicks, references in modern grammar books stop being confusing.
A determinative is a part of speech — a word class including articles (a, the), demonstratives (this, that), possessives (my, your), and quantifiers (some, many). A determiner is the syntactic role these words usually play before a noun.
Article
If you speak a language without articles — Russian, Japanese, Polish, Korean, Mandarin — articles in English are probably the single most stubborn topic you face. The rules feel small but the wrong choice (I went to the home instead of I went home) immediately marks you as non-native. Mastering articles is the highest-leverage move you can make for sounding natural.
Articles are a small group of determinatives — a, an, the, plus the zero article (no article at all) — that signal whether a noun is specific or general. The choice depends on the listener's knowledge, the noun type, and idiomatic context.
A2 | Elementary | Pre-intermediate
If you can order coffee, ask for directions, and tell someone what you did yesterday — but struggle the moment the conversation drifts into anything abstract — you're operating at A2. Knowing this matters: A2 is the level where most learners plateau because they reach for B2 material too early and burn out. Stay here and your foundations get unbreakable.
A2 is the elementary level in the CEFR framework, covering routine communication and the first wave of real grammar: past simple and continuous, present perfect, basic modal verbs, first conditional, and common verb-pattern rules.
Difficulty: Easy
If a textbook leaves you confused, sometimes the issue isn't the topic — it's that the practice material is layered with extra complications. Filtering by Easy strips that away. You get one rule at a time, in plain everyday language, with no trick questions. It's how you make a shaky foundation solid before stacking more on top.
The Easy difficulty tag marks beginner-level questions and challenges — typically A1 or early A2. Single-rule focus, short sentences, common vocabulary, one clear correct answer.