***** NOT A TEACHER *****
Dear Fellow Member Kimlang:
I am 99.99% sure that sentence B is wrong. If you and a friend had a good time, then you would tell him/her: "I hope [that] you enjoyed it, too."
The present tense would be correct in something like this:
I (not you) went to a lecture last week. I really had a good time. I hear that you are going to that lecture
this week. I hope that you enjoy it, too. (Many times in English, we use the present when speaking about the future. For
example: In November, Americans will vote for president. I hope that Mr. ____ wins.)
Your fellow member,