I would say A
this is because it is formed more properly, it gives the best reason out of the options, and includes a thorough fact.
hope this helps
I don't understand what the question is
maybe add a comma after the second to last word.
Answer:
a
Explanation:
because effect means what happened or the consequence
I believe the answer is full of drama
I apologize if this is incorrect or not what you are looking for.