Which action should the consultant take to troubleshoot this issue?

A nonprofit organization wants the 15th of the month listed as the Close Date for all recurring donations and has selected the 15th in the Day of the Month picklist. In reviewing Recurring Donation Opportunities it is found that some of the Opportunities have close dates at the end of the month.

Which action should the consultant take to troubleshoot this issue?
A . Check the Recurring Donation batch size.
B . Check the Error Log.
C . Check if the "Always use last day of the month" field is selected.
D . Check if the Custom Installment record was modified

Answer: C