GAUSS8 2022 Problem 22

In the list p, q, r, s, t, u, v, each letter represents a positive integer. The sum of the values of each group of three consecutive letters in the list is 35 . If q+u=15, then p+q+r+s+t+u+v is

Answer Choices
A. 85
B. 70
C. 80
D. 90
E. 75