God I read this so long ago but assuming Bob is the guy accused of beating the white guy's wife, I think the book lets the reader know that he's left handed through Atticus's demonstration when Atticus threw something at Ewell and he caught it with his left hand. Atticus then asks why he didn't catch it with his right and then Ewell says he hurt it when he was younger.
D. Because it talks about how you would not be able to enjoy the sport without the physics, however it says nothing on how scientific principals effect snowboarding.
Answer:
They intensified their efforts to increase sales
A statement of the author’s purpose in writing the book, which may include suggestions for using the book
I think it's C but I'm not really sure