Opposed vs. insisted

Test No. [color=blue]incompl/inter-36 “Go for it”, question 7

There were so many members of the political party who had the leader that he resigned.

(a) insisted
(b) invited
(c) apposed
(d) opposed

Test No. [color=blue]incompl/inter-36 “Go for it”, answer 7

There were so many members of the political party who had opposed the leader that he resigned.

Correct answer: (d) opposed

Your answer was: [color=red]incorrect
There were so many members of the political party who had insisted the leader that he resigned.
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missing the “that” in this case?

After insist it could be: insisted (that) he reisgned or should resign