Life is not only worthwhile if you are happy living it. You have been blessed with the chance to experience the world through your current life. If you are not happy living it, then you are doing something wrong. There are things out there that can make you happy. Go out and try something new. You should be happy that you have the chance to experience the world.
1) B. because A comma is used after every fanboys (for, and, nor, but, yet, so)
2) D. because the commas are placed wrong and the ; is not needed.
3) A. because just like D. the right punctioations A rent placed right and or just not needed.
A. Jerry loves tennis he plays every day.
Here, there is a need for a semi colon because there are two independent clauses (Jerry loves tennis, he plays every day) that need to be separated.
Hope this helps :)
