单项选择题

已知近年的环比增长速度为7.5%、9.5%、6.2%、4.9%,则定基增长速度为()

A.7.5%×9.5%×6.2%×4.9%
B.(7.5%×9.5%×6.2%×4.9%)-100%
C.(107.5%×109.5%×106.2%×104.9%)-100%
D.107.5%×109.5%×106.2%×104.9%