Final answer:
Angle COD is the acute angle, as it is the only angle mentioned that is less than 90 degrees.
Step-by-step explanation:
The student is asking which angle, out of the ones listed, is an acute angle. An acute angle is one that is greater than 0 degrees but less than 90 degrees. Based on the information provided, angle AOD is greater than 90 degrees, angle DOE is 90 degrees, angle COE is greater than 90 degrees, and angle COD is less than 90 degrees. Since an acute angle is the only one less than 90 degrees, the answer is angle COD.