The following charts show the different usages (用途) of pocket money(压岁钱) in Class 4, Grade 3. Read carefully and answer the questions below. 
How many students are there in Class 4, Grade 3 ?
| A.12 | B.24 | C.50 | D.53 |
Their pocket money is mostly spending in _________.
| A.Playing computer games | B.Eating snacks |
| C.Seeing films | D.Buying presents |
There are ________ fewer students playing computer games than eating snacks.
| A.4 | B.2 | C.12 | D.8 |