OA is E.
OE:
In the original sentence, the verb "had implemented" is in the past perfect tense, indicating that this event occurred at some point before the commissioner spoke. The verb "will try", however, is in the simple future. When the future is indicated from the point of view of the past, the simple future is not used. Instead, the conditional is required. For example, "The man said that he would buy a new car" is preferable to "The man said that he will buy a new car." We need to find a conditional verb. Moreover, the pronoun "it" begins a new clause and thus requires repetition of "that" in order to make clear, using parallel structure, that this new clause is still something that the commissioner said. For example, "The man said that he would buy a new car and that he would drive it everywhere" is preferable to "The man said that he would buy a new car and he would drive it everywhere."
(A) This choice is incorrect as it repeats the original sentence.
(B) This choice does not offer the conditional "would try", though it does offer another "that". The past tense "tried" is definitely wrong here because the trying will happen "in the future."
(C) This choice uses the past perfect tense "had tried" where the conditional "would try" is preferred. An extra "that" is needed to make the two clauses "the government had..." and "it had tried" parallel.
(D) This is a very tempting choice as it fixes the verb tense to the conditional. However, an extra "that" is needed to make the two clauses "the government had..." and "it would try" parallel.
(E) CORRECT. This choice provides the conditional and another "that".