You have an analytics application that runs hundreds of queries on BigQuery every few minutes using BigQuery API. You want to find out how much time these queries take to execute. What should you do? 

Answer options:

A. Use Stackdriver Monitoring to plot slot usage.
B. Use Stackdriver Trace to plot API execution time.
C. Use Stackdriver Trace to plot query execution time.
D. Use Stackdriver Monitoring to plot query execution times.

D