Cause and effect is showing the relation to what the aftermath is of everything someone does while problem and solution is showing how you fix a posed problem. Cause and effect always has the words therefor or so, look for hose clues
Look at the end of the root word , and you will see a addition to it . For example (classic) class is the root word . "ic" is the suffix
Answer:
im thinking its A.
Explanation:
A makes more sense because letter B isnt correct
C isnt a necessity for a research question
and E is completely wrong.