Just get over it you are there for your job focus on yourself and what you're doing because at the end of the day they would be doing their own thing.
The answer is (d.) mov(e). A free morpheme means a word that can stand alone. In the word REMOVAL, the word move can leave out and can stand on its own since it has its own meaning. The word move doesn't need prefixes to have a meaning.
Edith Wharton Should be the answer to your question
I Hope This Helps
Adventure time fin the human and Jake the dog
It should have the main idea and why it is.