Option B is incorrect as we cannot use the plural form after an article. The correct sentence should be ' The student uses a lot of inks.'
Option C is incorrect as we use the article 'an' before ink. Ink is a vowel-sounding noun, and the article 'an' is used before ink.
Option D is incorrect as ink is an uncountable subject; instead of have, 'has' should be used. The correct sentence should be 'Has your ink finished?'.
Option A is grammatically correct.
Answer is option A.
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