The correct option is D 5
Let us write the given cryptogram again, with all the decoded integers for simplicity.
ABC
×DE––––––
ABC
+ECMA×––––––––––––
ECDMC–––––––––––
⇒2B6
×71–––––
2B6
16M2×–––––––––
167M6––––––––
We can now see that 2+M=7, which means M=7−2=5. Thus the value of M is 5. So, option (3) is correct.