In context, which of the following is the best way to revise sentence 11 (reproduced below)?

Question

The principles they developed are still used in aircraft design today.

A
The principles they developed are still used in aircraft design today.

B
The principles that were developed by them are still used in aircraft design today.

C
They developed principles that are still used in aircraft design today.

D
The principles they developed are still being used in aircraft design today.

Answer 1

The best way to revise sentence 11, while maintaining clarity and conciseness, is option C:

C
They developed principles that are still used in aircraft design today.

This revision is more direct and removes the passive voice, making the sentence clearer and more engaging.