Which sentence is subjunctive and conditional?
will you be able to meet me at the party?
if i had seen the dress in your size, i would have bought it for you.
i'll give you a call later if we decide to go out. if it isn't raining, we will go to the park.

B: If I had seen the dress in your size, I would have bought it for you.

Explanation:

The sentence B is both subjunctive and conditional. The subjunctive mood  is used to express a condition contrary to fact, a wish, or a suggestion , it uses words like: I wish; would have etc. The conditional mood  shows a condition before something else happens (If; Could; May).  The conditional is used in the main clause, and the subjunctive, in the subordinate clause.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.