M = {1,2,3,4,5, …, 20},Q = {3,4,5,6,7,8}and R = {2,3,5,7}
If Q and R are subsets of M, find Q∩R.

• A.{3,5}
• B.{5,7}
• C.{3,5,7}
• D.{,2,3,5,7}