What size of PGA would give the maximum benefit?

The users in your online transaction processing (OLTP) environment complain that the query response time has increased considerably. On investigation, you find that the Program Global Area (PGA) is undersized and using temporary segments for sort operations. You plan to increase the size of the PGA and there is ample amount of memory available to you. You used the PGA advisor to check the correct size for PGA. View the Exhibit and examine the content of the PGA advisor.
What size of PGA would give the maximum benefit?
Exhibit:

The users in your online transaction processing (OLTP) environment complain that the query response time has increased considerably. On investigation, you find that the Program Global Area (PGA) is undersized and using temporary segments for sort operations. You plan to increase the size of the PGA and there is ample amount of memory available to you. You used the PGA advisor to check the correct size for PGA. View the Exhibit and examine the content of the PGA advisor.