Answer:
Answer is C
Explanation:
Key performance indicators are sets of quantifiable measures used to evaluate how effectively an organization is achieving its key organizational objectives.
The keyword here is "quantifiable".
Therefore, recording the percentage of help desk calls answered in the first minute helps to know just how effective the company is probably helping its customers have great experience or easy usage of its products or services by the number of customers calls answered to, or how effective the customer service is.
