My answer is(E) . It took me 25 seconds.
(A) "trying to" is not entirely incorrect, but
(1) it sounds informal
(2) it is a gerund (i.e. a noun form of a verb) In (E), "attempt" is a proper noun. ("attempt" can also be a verb.) When a proper noun exists, we prefer it to a gerund.
(B) The function of "that-clause" is suspect. It seems to be an appositive clause, but "trying" is not equivalent with "it..." clause.
(CD) Redundancy.
...
(A) "trying to" is not entirely incorrect, but
(1) it sounds informal
(2) it is a gerund (i.e. a noun form of a verb) In (E), "attempt" is a proper noun. ("attempt" can also be a verb.) When a proper noun exists, we prefer it to a gerund.
(B) The function of "that-clause" is suspect. It seems to be an appositive clause, but "trying" is not equivalent with "it..." clause.
(CD) Redundancy.
...
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