Your answer would be A.
I used D and got it wrong but when i checked it was A
Here is the proof have a nice day!!
D. All of these. Informational references are available in all of these.
Pre-disaster planning saves lives.
Answer:
subordinating conjunction
Explanation:
surbordinating conjunction are:
once , while, when, whenever, before, after
The purpose is to help the reader/student/? understand the subject at hand and make it easy to get evidence for your claims/ideas.