Study the information carefully and answer the following questions. There are 50 children in a play school. There are total 3 groups. In group 2 there are a total of 20 children. In group 1 there are half as many children in group 2. Group 3 has the same number of children as in group 2. How many children are there in group 1.

• A.  50                               
• B.  20           
• C.  10                               
• D.  30