A dependent clause adds something to a sentence but cannot be a standalone sentence, hence "dependent." In this sentence, "when I had... phone" is a dependent clause.
Answer:
No prob
Explanation:
I don't even know what you did wrong
Answer:
a ( it's the only one that makes sense to me)
Explanation:
You should explain your supporting evidence at the end of your statement. It should include important details that refers to the thesis.