Write an Expression in Terms of the Given Variable(s)that Represents $\mathrm { d } + 10 ;$

Multiple Choice

Write an expression in terms of the given variable(s) that represents the indicated quantity.
-Mark has half as many stickers as Derek. If Derek has d stickers and Mark m stickers, and Derek gives Mark 10 stickers, how many stickers does each have in terms of d?

A) Derek: $\mathrm { d } + 10 ;$ Mark: $\frac { \mathrm { d } } { 2 } - 10$
B) Derek: $\frac { d } { 2 } - 10 ;$ Mark: $d + 10$
C) Derek: $\mathrm { d } - 10$ ; Mark: $\frac { \mathrm { d } } { 2 } + 10$
D) Derek: $\frac { \mathrm { d } } { 2 } + 10 ;$ Mark: $\mathrm { d } - 10$