Your teammate has asked you to review the code below. Its purpose is to efficiently add a large number of small rows to a BigQuery table. 

Which improvement should you suggest your teammate make? 

Answer options:

A. Include multiple rows with each request.
B. Perform the inserts in parallel by creating multiple threads.
C. Write each row to a Cloud Storage object, then load into BigQuery.
D. Write each row to a Cloud Storage object in parallel, then load into BigQuery.

B