Which of the following is most important when setting goals? a. working late into the night is often necessary to reach goals. b. standards should be as high as possible. c. tasks should be included but are unimportant. d. goals should be difficult but realistic.

D. When you set a goal, you want it to be difficult but realistic. For example, if you are not very good at running, you maybe want to set a goal like "try to run 1 mile without getting tired this month". This is a difficult goal to reach, but it is realistic. If you had said "Run 100 miles without getting tired this month", this is unrealistic because you are not very fit
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D because to reach your goals they she be set to be a little difficult so that there is some work but not so high that it would be impossible to reach.

Yes i have used it before