Step 1: Understanding the sentence.
The sentence is “Children ........... to attend the programme.” It is incomplete, and depending on the tense context, multiple verbs can correctly fit.
Step 2: Analyze each option.
(A) had gone: This fits in the past perfect tense. Example: “Children had gone to attend the programme before it started.” Correct.
(B) will go: This fits in the future tense. Example: “Children will go to attend the programme tomorrow.” Correct.
(C) went: This fits in the simple past tense. Example: “Children went to attend the programme yesterday.” Correct.
(D) All (A), (B), and (C): Since all three are grammatically correct depending on tense, this is the best answer.
Step 3: Conclusion.
All options (A), (B), and (C) are correct in their respective tenses. Thus, the correct answer is (D).