The first portion of this answer is correct, but the second is not, according to the question:
"Energy modeling took two weeks which was longer than expected. "
The answer explained, “An additional two weeks brings it to three weeks total.”
This part of the answer is incorrect.
The question did not say “Energy modeling to two weeks longer” but took “two weeks” - that is ONE week longer than expected.
Regardless, Energy Modeling is NOT part of the critical path, and therefore does not add any time to the overall project.
Please amend the reason given for incorrect answers.