Arif, Ajay and Madhav secured \[m+20,\] \[2m-17\] and \[m-5\]marks respectively in an English test. What is their average marks?

• A.  \[\frac{4m-8}{3}\]                          
• B.                         \[\frac{4m-2}{3}\]                          
• C.                         \[\frac{4m+8}{3}\]                         
• D.                         \[\frac{4m+2}{3}\]