A verb is used to describe an action.
Example: Joan is running to the park to play frisbee.
The key words are: is running.
So, in your question, since Uncle Joe is growing a beard, that'll mean your verb tense is present progressive. It's present progressive because he's growing something, and things that grow have a process to follow through.
I hope I helped :)
Answer:
B. <u>Even though you forgot my birthday</u>, I baked a cake for yours.
Explanation: