Which is the best thesis statement for a paper of two or three pages?

(a) more and more people are quitting smoking because it's bad for your health

(b) the main reason people are quitting smoking are that it increases the risk of lung cancer, its offensive to others and it's very expensive

(c) there are many reasons why people fail when they attempt to quit smoking

(d) smoking is a health epidemic in the united states of america and people need to realize that quitting smoking is essential to good health

Which sentence is punctuated correctly?  a.under a microscope; the organisms look a bit like ruffled tennis balls they have armored plates that fit together to make a round shape. b.when the water is disturbed; the organisms respond by glowing this makes swimmers look like floating beams of blue light. c.there is a bay in puerto rico that seems to light up at night; the light comes from tiny organisms in the water. d.the luminescence attracts visitors from around the world people are curious to see; this beautiful otherworldly sight.