Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: ক ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2013
Topic: Correction (Sentence Correction), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The sentence "He hardly comes here." is correct because it uses the adverb "hardly" properly to convey that he infrequently visits the place in question. The word "hardly" indicates a low frequency or limited occurrence, making it clear and effective in its meaning.

In contrast, the other options contain grammatical errors or incorrect usage of negation.

Option A: "Unless he does not read attentively, he will fail." is problematic because "unless" and "does not" introduce a double negative, creating confusion about the condition under which he will fail.

Option B: "I shall wait until you do not come." also struggles with clarity; "do not come" implies waiting for an absence, which can sound awkward or misleading.

Option C: "Study hard lest you fail." is grammatically correct but may sound formal or outdated in a conversational context.

Thus, "He hardly comes here." stands out due to its straightforwardness and clarity regarding the subject's attendance, making it the best option among the four.