Hi. I hate to post a link to a pic, but it was already written up and I don't know the special formatting.

Could someone please take a look and tell me if it is correct? I'm pretty sure (a) and (b) are correct, but (c) is confusing me and I'm not sure if I did it right.

Thank you.

https://gyazo.com/807a3d2a0917e01852dc106d84c2bf90