Each day, Jane swims a certain number of lengths. On day 1, she swims 8 lengths. Each day, she swims 8 more lengths than the day before. What is the average number of lengths she swims each day in the first week? Choose the correct choice from the following options:
A) 8
B) 16
C) 32
D) 34
E) 40
=8 + 16 + 24 + ... + 56   =8(1+2 + 3 + ...+ 7)/7   =8(7(7+1))/(7*2)   =4(8)   =32   Option 32
<result>C</result>
Each day, Jane swims a certain number of lengths. On day 1, she swims 8 lengths. Each day, she swims 8 more lengths than the day before. What is the average number of lengths she swims each day in the first week?