What is the simplified form of the following expression? 6c2+2.5d-d+2c2-3s
A4c2-1.5d
B6c2+0.5d
C8c2-1.5d
D8c2+1.5d
A4c2-1.5d
B6c2+0.5d
C8c2-1.5d
D8c2+1.5d