20. Bankers require that the financial information presented to them by mortgage applicants be complete and follow a prescribed format.
(A) be complete and follow a prescribed format
Correct. "require" is a word that has the meaning of demanding, just like "mandate", "demand", "need", "suggest", "insist", etc. When you encounter these words, the correct usages are "require + that + bare infinitive". Here, bare infinitive just means infinitive without the "to", so it is the original form of verb. (ex: bare infinitive of "be" is "be", "make"->"make", etc.)
In addition, the "and" signals parallelism. "be complete..." and "follow..." are parallel since they are both verbs.
(B) is complete and it follows a prescribed format
By the explanation in A, "is" is not bare infinitive, so it is wrong.
(C) be complete and a prescribed format is followed
By the same explanation in A, bare infinitive form of verbs should be used. Since "and" signals parallelism, "is followed" should also be bare infinitive -> "follow"
(D) to be complete and a prescribed format be followed
By the same explanation in A, "to" is wrong.
(E) be completed, and it followed a prescribed format
By the same explanation in A and C, "followed" is wrong.