Question

which strategy is the best way to improve the written expression in a redundant sentence?
add additional modifiers and phrases.
eliminate powerful words.
include words that state the obvious.
remove unnecessary repetition.

Explanation:

A redundant sentence contains unnecessary repeated words or ideas. To improve it, the core fix is removing this unneeded repetition. Adding modifiers, eliminating strong words, or including obvious statements would either worsen redundancy or not address the issue.

Answer:

Remove unnecessary repetition.