I feel like this is conditional but I'm not too sure, I would go with A because it is a perfect past tense while D is simple past tense (I would use D is normal conversation though)
D would be like answering a question "what did you do last night?" "I went to bed two hours before it started raining"
A is like you're telling someone what you have already done using active voice "I had gone to bed two hours before it started raining"
Take what you will from this, my friend. Sorry I can't be more of a help
Answer:
do you still need help if yes I will answer in the comments
Answer:
The fertility rate measures the number of births per 1,000 women of childbearing age (ages 15 to 44) occurring in a particular year; birth rates refer to this measure within particular age groups.
Explanation:
What? Please comment what you mean so I can help!
Answer:
increased interest rates, lower income, decline in investments, uncertainty increases
