Leon has made a long list of methods to use in conducting his research. he looks at his list and feels confused and overwhelmed. leon has forgotten to a. study his topic thoroughly. b. select only one of the methods. c. narrow down his method choices. d. create his research schedule.

narrow down his method choices.

Explanation:

It doesn't matter if you take notes or make a list if you can't simplify your list to the point when it actually becomes useful. Having a list of option that is way too long will make it all seem like noise, eventually. That's why you need to compare the options and discard some (if possible, discard most) so you can have, in the end, practical choices.

there is no sentence to look at.

the underline word is basically like a prepositional phrase.