Answer:
B. cyberbullies
Step-by-step explanation:
First off, "manipulating" isn't a compound word, it's just a different form of the word "manipulate". So we have C off our list.
You should notice that "cyberbullies" is made of two words; "cyber" and "bullies". And with a little search in the dictionary, we can prove that "dependent" and "simultaneously" aren't compound words. Our answer is B.
Hope this helps!