I believe the answer is C because it has multiple answers in one, and the most effective early childhood curriculum can have more than one solution.
You will gain more health benefits because your training the muscles to be under stress.
In the ICD-10-CM index to diseases and injuries (alphabetic index), the code next to the main term called a default code. It would represent the condition that is commonly related with the main term. In a case where the condition is not documented in a record without any information, then this code should be assigned.
A RN Nurse would be better and quicker and a good start. Many schools are forwarding that position and beginning to make classes about it, as the nurse job is the future.
That's my opinion, take it from a Fire Fighter and soon to be EMT.