Which of the following contains an error in verb voice?

Question

I would buy a large sailing yacht if I were to become rich.

Had I known you were going to be late, I would have started by now. **

If I were going on this trip, I would have planned a fishing trip.

If I was stronger, I would be able to do more than one push up.

I think its B, but honestly I don't know about this one. If you can please give the answer and explain why it's correct.

Answer 1

D is the right answer.

Since the sentence begins with "if", the verb needs to be in the subjunctive. The correct verb is "were" not "was."

http://www.grammar-monster.com/glossary/subjunctive_mood.htm

Answer 2

Thanks!