Option C contains a run-on sentence (I would call it a comma splice).
A better way to phrase the sentence could be:
1. A giant clam grows huge; it can weigh hundreds of pounds.
2. A giant clam grows huge. It can weigh hundreds of pounds.
Dear Dad,
This is my apology for driving your car out with out permission. I understand that not asking was wrong of me and I give you my word I will do better. I'm truly grateful for all you do for me and I'm sorry to mistreat you and your trust the way I did. I genuinely hope you can forgive me for my poor choices and bad actions. I am not even aware what I would do without you. I love you very much and I'm SO sorry.
Love
(enter your name),
B. because u must know about whoever you're writing about in your <span>biography.</span>
1. Went, Went
2. started
3. Finished, went
4. finished, watched
5. turned, made
6. came, disappeared
7. I didn’t, saw
8. switched, left
9. went, did
10. bought, saved
11. went
12. went
13. didn’t go
14. did, manage, left, got
15. got, called
