Step 1: Tense and Voice Identification. The sentence uses the past tense ("did not manage"). Therefore, the missing element must also be in the past tense.
Step 2: Structural Analysis. The causative construction "he got it fixed" correctly conveys the meaning that he arranged for the item to be repaired by another party.
Step 3: Elimination of Incorrect Options. - (B) "getting it fixed" (present participle) is grammatically inconsistent with the past tense context.
- (C) "gets fixed" (simple present) does not align with the past tense narrative.
- (D) "got fixed" is incorrect as "he got fixed" would imply the subject himself was repaired, altering the intended meaning. \[\boxed{\text{The correct answer is (A) got it fixed.}}\]