Answer:
Depending on what your teacher has taught, A or D
Explanation:
A is a good answer, but it might be too basic, and lead to even more faulty logic making D a better answer.
Its linking 2 closely related independent clauses.
A antonym for "old fashioned" is new, because when something is old fashioned, it's usually old, and doesn't look in a good state, while something is new, it looks better than something old fashioned, or up to date
I hope this helps! :>