Explanation:
form an idea of the amount or number evaluation means
The appropriate response is contextual perspective. It alludes to the investigation of living beings connecting in and with an authentic and current situational setting. It is an approach in light of contextualism, a reasoning in which any occasion is translated as a continuous demonstration indivisible from its present and authentic setting and in which a drastically useful way to deal with truth and significance is received.
C. Present particle
because the verb (ing) is present