Which of the following compounds exhibits stereo-Isomerism?

It has an asymmetric carbon atom. so, it is optically activeOption (1)  is  2-methyl butane It doesn’t contain asymmetric carbon atom. so it is  optically inactiveOption (2)  is  3-methyl butyneIt  also doesn’t  contain asymmetric carbon. So it is also optically inactiveOption (3)  is  3-methyl butanoic acidIt  also doesn’t  contain asymmetric carbon. So it is also optically inactive