Odd one out

I. Odd one out:

1.       A. kayak              B windsurf           C. dive                  D polluted

2.       A. sorry                B. free                  C. kind                 D water

3.       A safe                   B. tall                             C. dolphin            D clean

4.       A. first                  B. ugly                 C. then                 D. next

5.       A. beautiful          B.waterski            C. swim                D. snorkel

6.       A.penguin            B. monkey            C. camel               D. angry