Sentence Correction

A year advantage in a new computer product or process being introduced can give a company a significant edge on its competitors.
a. A year advantage in a new computer product or process being introduced
b. Introducing a new computer product or process by a year earlier
c. A year's advantage to introduce a new computer product or process
d. To introduce a new computer product or process by a year earlier
e. Being a year ahead in introducing a new computer product or process

OA is D