Eye-tracking studies investigating attention as we carry out actions such as making a peanut butter sandwich shows that a person's eye movements .
a. usually followed a motor action by a fraction of a second
b. was influenced by unusual objects placed in the scene
c. were determined primarily by the task continually scanned all objects and areas of the scene

The correct option is C: were determined primarily by the task.

Explanation:

When you are unaware of a situation that might be threatening to the eyes, the eye movement follows a motor action by a fraction of a second. However, when you are accomplishing a task, especially one that you are focused on, like making a peanut butter sandwich, the movement of the eye is influenced by the task being carried out.