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