Question

the engineer advised them to buttress the bridge with steel beams.
buttress
buttres
buttriss
no change is needed.

Explanation:

The word "buttress" is the correct spelling. The original word in the sentence is already spelled correctly, so no change is needed. The other options have incorrect spellings: "buttres" is missing an 's', "buttriss" has an extra 's' and incorrect letters.

Answer:

D. No change is needed.