GMAT Sentence Correction (SC) | Re: While the average age of its population is below 40 years, the annual

While the average age of its population is below 40 years, the annual GDP of a nation is expected to rise at a rate above 5 percent annually and then as the average age of its population increases beyond 40 years,stabilizing at 3 percent, a growth rate that will mainly be driven by addition of higher quality services.

A. stabilizing at 3 percent, a growth rate that will mainly be driven by
B. to stabilize at 3 percent, a growth rate that will mainly be driven by
C. and then to stabilize at 3