Topic: Conjugation of Verb,

Best Answer Explained in Below-:

The phrase "What strikes me the most is the greenery of Khulna University" uses the verb "strike" in the sense of making a strong impression or impact on someone. In this context, "strikes" is the third-person singular form of the present tense. When converting "strike" to the past tense, it becomes "struck," which is the correct form used for this expression.

The options provided include forms that do not fit grammatically or contextually. "Striken" is incorrect as it is not a standard English word; the proper past participle of "strike" is "struck." "Striked" is also incorrect; "strike" does not take "-ed" in the past tense. "Strok" appears to be a misspelling or a non-word, as the correct term would be "stroke," which refers to an entirely different meaning related to physical contact or a sudden event.

Thus, "struck" is the appropriate choice as it reflects the past tense of "strike," aligning perfectly with the intent of the sentence, highlighting the lasting impression made by the university's greenery.