Topic: Pronoun (সর্বনাম),

Best Answer Explained in Below-:

The sentence in question originally uses the phrase "these kind of detective stories," which is grammatically incorrect. The main issue arises from the mismatched plurality of "these" and "kind." The word "kind" is singular, which should correspond with either "this" (singular) or "that" (for singular, distant reference). Therefore, the correct choice is "this kind of detective story."

Option C, "this kind of detective story," properly matches the singular term "kind" with the appropriate singular demonstrative "this." In this construction, "this" refers to a single type of detective story, which maintains grammatical consistency. Also, since "story" is singular, it aligns with "kind" in a coherent manner.

Other options:
- Option A ("these kind of detective stories") is incorrect as it combines plural "these" with singular "kind."
- Option B ("these kind of detective story") is similarly incorrect due to the plural demonstrative and the singular count noun.
- Option D ("this kinds of detective story") fails because "kinds" is plural, which disrupts the singular reference initiated by "this."

Thus, the correct choice is C, maintaining both grammatical accuracy and clarity in the sentence.