How can an architect find information about who is creating, changing, or deleting certain fields within the past two months?

How can an architect find information about who is creating, changing, or deleting certain fields within the past two months?
A . Remove "customize application" permissions from everyone else.
B . Export the metadata and search it for the fields in question.
C . Create a field history report for the fields in question.
D . Export the setup audit trail and find the fields in question.

Answer: D