Step 1: Understanding the sentence structure.
The sentence describes actions taken by the Israeli Air Force, providing details about the timing and targets of the bombing. The error, if any, could be in the structure or word choice in any of the four parts of the sentence.
Step 2: Analyzing each part.
(1) Israeli Air Force fighter-bomber aircraft had bombed: This part is correct. The subject and verb agree, and the use of the past perfect tense ("had bombed") is appropriate in this context.
(2) roughly 100 Hamas-operated security installations: This part is correct as well. The phrase is grammatically sound and correctly describes the number of installations.
(3) during the first wave of the strike: This part is also correct. The phrase is clear and makes sense in the context of the sentence.
(4) during the first wave of the strike: This part contains an error. The word "roughly" should modify the number, not the "100," making the construction "roughly 100" the correct choice. The term "roughly" is misplaced. The correct phrase should be: "roughly 100 Hamas-operated security installations."
Step 3: Conclusion.
The error is in part (4), where "roughly" should be placed correctly before "100". Therefore, the correct answer is (D).