What is a more formal way of saying “stick with”? ie. “To keep the project as simple as possible, it is best to choose only one topic and stick with it”

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