The most appropriate word that could substitute 'skillful' would be C.<span>masterful
The world skilfull in this particular context means having the ability to do something with a certain amount of expertise.
The word masterful have a similar meaning because it indicates the person able to do that certain thing with higher than average virtuoso. </span>
ok I'll do that rn!
...................................
The answer is D in this situation
Answer: He rewrites a political article that uses unclear language.
Explanation: The Answer is B