Directions:
Tech Vinayak software company before selling a package to its clients, follows the given schedule.

Question:
Which five consecutive months have the lowest average cost per month under new technique?

Option A):
None
Option B):
11-15
Option C):
9-13
Option D):
1-5

Correct Answer is Option B):
11-15

Explanation:
Average cost is lower for 11-15.