An appropriate choice is ...
A. Decides that she will give it some more thought and do some research.
_____
In the real world, the most likely response will be B. The second most-likely response will be to ask the assistant to do the research. Another possible response is to make the counter-suggestion that e-mail, text, or social media reminders be used.
A- geology deals with the environment (also its the odd one out)
The answer is the DEA, or Drug Enforcement Administration. This department deals with drug-related illegal activity.
Bringing in money, paying bills, housing, etc
C, positive self-talk
If you tell yourself you can do something, you will.