If (A+B) = 5, (B+C) = 6 and (C+D) = 3, what is the value of (A+D)?  Choose the correct option.
A) 16 . B) 8 . C) 7 . D) 2 . E) - 2 .

Rationale: "given a + b = 5 b + c = 6 c + d = 3 ( a + b ) - ( b + c ) + ( c + d ) = ( a + d ) = > 5 - 6 + 3 = 2 . option d . . ."
Answer: D