A and C can be eliminated for using present perfect (has waited) for an event that happened in the past.
D can be eliminated for using "was waiting".
As you've identified, the only difference between B and E is the word "that." In this case, we need it because "his client was not going to show up" is a dependent clause. E is the better option.
This is a good example of a fairly common situation on Sentence Correction: two answers that are almost identical. When that happens to me, I like to "reset" and focus on the difference(s) between the two.
Bill
D can be eliminated for using "was waiting".
As you've identified, the only difference between B and E is the word "that." In this case, we need it because "his client was not going to show up" is a dependent clause. E is the better option.
This is a good example of a fairly common situation on Sentence Correction: two answers that are almost identical. When that happens to me, I like to "reset" and focus on the difference(s) between the two.
Bill
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