This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to lose fat around the fingers
Do grip exercises.
One of the easiest and quickest ways to increase the strength in your hands is to do simple grip exercises. Do a few sets of 30 to 50 grips in each hand with a grip or ball of your choice.

pick from the following. a). Stress balls are usually palm-sized balls that you can squeeze to exercise your hand. Don't have one? Use a tennis ball. b). You can do a hand grip exercise in your gym room, or on the floor near the back of the gym. Put your hands palm side up and squeeze. c). This can help warm up both of your hands and also strengthen your muscles. Consider attaching your palms and fingers to your own body and performing a combination of grip and handgrip exercises. d). Perform 3 to 5 repetitions of each exercise before switching hands. Position your thumb on the ball of your hand.
The answer is:
a).