According to the Survey of Senior Managers by Graham,Harvey,and Rajgopal,senior

According to the survey of senior managers by Graham,Harvey,and Rajgopal,senior managers admitted to the following:
I.adjusting their firms' operations and investments in order to manage earnings;
II.decreasing discretionary spending in R&D,advertising,or maintenance to meet earnings targets;
III.deferring or rejecting investment projects with positive NPVs in order to meet earnings targets

A) I only
B) II only
C) I and II only
D) I,II,and III