Throw a monkey wrench into the plan

Wich statements best identifies a problem with this method

Me? which of the following describes theodore roosevelt’s ideas about the role of the government? a) to keep the powerful from taking advantage of small business owners b) to all citizens get rich and to take care of the lazy c) to break all company trusts because all big businesses wanted to bully the smaller ones d) to close off all wild lands and leave them untouched

What is the italicized part in the sentence , all of the operators are efficient.