A want is something that someone had the desire for, but doesn't necessarily need. A need however is something that the person may not have a desire for, but is very important.
The answer to ur question will be abcd sorry
Answer: D is the answer.
Explanation: Cause and Effects Citations are when one is to look for a solution to a problem, most often, and D (last option) is the only option that does so and spells it out.
The first one,hope this helps:)