The correct option is C 34, 41
Let the next two terms in the sequence be x and y respectively.
6, 13, 20, 27, x , y ....
13 = 6 + 7
20 = 13 + 7
27 = 20 + 7
Observing the pattern we can find out that each term is obtained by adding 7 to the previous term.
x = 27 + 7 = 34
y = 34 + 7 = 41