According to the Textbook, the Two Main Drawbacks of Plans

According to the textbook, the two main drawbacks of plans are that ____ and ____.

A) they can be discouraging if they are too rigid and detailed; they tend to be overly optimistic
B) they can be discouraging if they are too rigid and detailed; they tend to be anxiety-provoking
C) they tend to distract people from actually completing the tasks at hand; they tend to be overly optimistic
D) they tend to distract people from actually completing the tasks at hand; they often fail to prioritise the most important things