The Perimeter of a Rectangle Is $28 \mathrm{~cm}$ the Length Is

The perimeter of a rectangle is $28 \mathrm{~cm}$ . The length is $8 \mathrm{~cm}$ longer than the width. What are the length and width of the rectangle?

A) Length: $15 \mathrm{~cm}$ ; width: $7 \mathrm{~cm}$
B) Length: $14 \mathrm{~cm}$ ; width: $6 \mathrm{~cm}$
C) Length: $11 \mathrm{~cm}$ ; width: $3 \mathrm{~cm}$
D) Length: $8 \mathrm{~cm}$ ; width: $3 \mathrm{~cm}$