PT 48 S2 Q4

Henri has exactly five electrical appliances in his dormitoryroom: a hairdryer, ... ...

If Henri were to use exactly three appliances, then what is the total number of different groups of three appliances any one of which could be the group of appliances he is using?
(A) one
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Grouping: Lesson Set 1 (of 3) - Intro