**Choose the group which is different from the other **

**17,37 47,97****31,41, 53, 67****71,73,79,83****83,89,91,97**

Group 1: 17, 37, 47, 97

Group 2: 31, 41, 53, 67

Group 3: 71, 73, 79, 83

Group 4: 83, 89, 91, 97

we can see that all the numbers in each group are prime except for Group 4, which contains the number 91.

Therefore, the correct answer is Group 4: 83, 89, 91, 97, as it is the group that is different from the others.