Complex Everyday Syllogism – UGC NET Question

The premises place all course textbooks inside the class of expensive books and then state that some of the books I own are those textbooks. As a result, those particular owned textbooks must also be expensive. Therefore, at least some books that I own fall under the expensive category. This is a straightforward “some A are B; all B are C; therefore some A are C” style reasoning.

Option A:
Option A overgeneralises by claiming that all owned books are expensive, which is not justified; I may also own inexpensive books.

Option B:
Option B conservatively states that some of my books are expensive, exactly those that are course textbooks, which is logically required by the premises.

Option C:
Option C contradicts the premises, since we have already established the existence of some expensive owned books.

Option D:
Option D introduces expensive books that are not textbooks, about which the premises say nothing, so it cannot be inferred.