The answer is C. Targeting a particular area for improvement
Specificity principle stated that whatever you do in the gym, should be relevant to your desired outcome
For example, if you are a rowing athlete, it should be best if you focus on upper body training more than lower body because you need your upper body strength more than you need the lower
C.Currency
Explanation.
A factor of production is a term used to describe the inputs used in the production of goods and services in order to make a profit.The factors of production are land,capital,labor and entrepreneurship.For example in a capitalist economy, the factors of production are controlled by private individuals for their own profits.
We never get to have fun anymore because that's his girlfriend trying to get him to hang out with her more often