Select the most appropriate option to fill in the blank.

The monster trucks have very _____ engines, they can probably pull a train coach without any problem.

powerful

The most appropriate option to fill in the blank is powerful.

The sentence is talking about the strength of the engines of monster trucks. The word "powerful" means having a lot of strength or force. It is the most appropriate option in this context because it conveys the idea that the engines of monster trucks are very strong and can do a lot of work.

The other options do not make sense in the context of the sentence.

• "Dominant" means having a lot of power or influence. It does not make sense to say that the engines of monster trucks are dominant.
• "Forceful" means having a lot of force or strength. It is similar to "powerful" but it is not as strong.
• "Impressive" means causing admiration or awe. It is not the right option because it does not convey the idea of strength.