Jami is doing an experiment to find out how temperature slows down or speeds up the sprouting of bean seeds. to prepare for the experiment, she plans to put soil into three foam cups and place six seeds in each cup. when jami performs the experiment, which of the following should she keep the same for all of the cups of beans? i. the amount of sunlight ii. the amount of water iii. the temperature iv. the amount of fertilizer a. i, ii, and iv only b. i and iii only c. i and ii only d. ii and iii only

A) I, II, and IV only

The things you want to keep the same are the controls. 
Keeping these things the same will help your independent variable, what you're changing (aka temperature), to be the only thing affecting your dependent variable, what you're measuring that usually changes because of the independent variable (aka speed of sprouting), giving you more accurate results.

From your list of choices, notice that the only thing you'll be changing is the III, the temperature. You want the amount of sunlight (I), water (II), and fertilizer (IV) to remain the same, or else those things might affect your final results. You want temperature to be the only thing affecting your final results!