I'm assuming that you are looking for the definition of the word restorative. Here is a tip for the future. Lets pretend i have no idea what the word restorative is, but in my situation, i can't look it up. Plug all of the answers in, and see what makes the MOST sense.
1) Sometimes, the best cause of pain is a good book, some warm soup, and plenty of rest.
2) Sometimes, the best relief of the past is a good book, some warm soup, and plenty of rest.
3) Sometimes, the best way to infect yourself is a good book, some warm soup, and plenty of rest.
4) Sometimes, the best way to restore your health is a good book, some warm soup, and plenty of rest.
Now, looking at them simplified, the one that seems the most like the definition is 4.
