Look at the following senteces. The punctuation marks underlined are incoorectly used . Replace them appropriately.

a. Each boy alone was very well behaved :  together they meant trouble.

b. Your reading list comprises the following books ,  Catcher in the Rye ;  The White Tiger ;
The Inheritance of Loss ;  and Life of Pi.

c. I played on the beaach , I went parasailing : I met my friends in the playzone , yes ;  I really did have a wonderful holiday.