12. which sentence contains an incorrect end mark?

a: do you remember how to get to the mall from here?
b: i have been there many times.
c: which store shall we visit first.
d: look at the crowds!

13. identify the correctly punctuated sentence.

a: throwing the football, is difficult for some people.
b: throwing the football, he pulled a muscle in his arm.
c: throwing, the football, kicking field goals and tackling are all important.
d: throwing the football he did not notice the coach approaching.