During the system study, the executive vice-president and the other managers exercise their responsibility of

The correct answer is (B) controlling.
Let's break down why:

System Study Overview: A system study involves a thorough examination of an existing system (or a proposed new one) to understand its strengths, weaknesses, and areas for improvement.

Now let's look at the options in the context of a system study and management's role:

(A) planning: While planning is important, during the system *study* itself, the main activity isn't creating new plans. Planning happens more before and after the study.

(B) controlling: Controlling, in this context, means ensuring that the system study is conducted properly, stays on track, meets its objectives, and aligns with the organization's goals. Managers oversee the process, monitor progress, and make adjustments if needed. They are making sure the study is yielding useful information.

(C) directing: Directing involves telling people what to do. While managers provide some direction, during a study, their primary role is to *oversee* and *monitor* (control) the process, not micromanage every step.

(D) organizing: Organizing, like planning, is something that happens *before* the system study really gets going. It involves setting up the team, resources, and structure for the study.

(E) None of the above: This is incorrect because 'controlling' accurately describes the management role during the system study.

Therefore, executive vice-presidents and other managers are exercising their responsibility of *controlling* the system study process to ensure it's effective and beneficial for the organization.