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 correct answer is D: "Jesika, my student, is no leave today." This sentence employs proper punctuation, specifically commas, to separate the phrase "my student" from the rest of the sentence. This phrase acts as an appositive, providing additional information about "Jesika." Appositives are typically set off by commas to clarify that they are not essential to the sentence's main meaning.

In contrast, the other options fail to use commas correctly or are grammatically incorrect. Option A includes an erroneous placement of a comma before "is" and ends incorrectly with a period after "today." Option B misplaces a comma before "is," resulting in a fragment. Option C lacks the necessary commas, making it difficult to identify "my student" as a descriptive phrase, thus impairing clarity.

Overall, the sentence in option D clearly states who Jesika is, while maintaining grammatical integrity and proper punctuation, ensuring that the reader can easily understand the structure and meaning without confusion.