The correct answer is:
E. No errorThe sentence is grammatically correct. The word “for” is used correctly in the phrase “for a long time.” The word “waiting” is the gerund form of the verb “to wait,” and it is used correctly in the phrase “by making me waiting.” The word “upset” is an adjective, and it is used correctly in the phrase “my schedule is getting upset.”
The sentence can be rephrased as follows:
Are you aware that by making me wait for a long time, my schedule is getting upset?
The sentence is still grammatically correct, but it is more concise and easier to read.