South Korea has witnessed the world's most dramatic growth

[BTGmoderatorDC]

South Korea has witnessed the world's most dramatic growth of Christian congregations; church membership is expanding by 6.6 percent a year, fully two-thirds of the growth coming from conversions rather than the population increasing.

(A) coming from conversions rather than the population increasing
(B) coming from conversions rather than increases in the population
(C) coming from conversions instead of the population’s increasing
(D) is from conversions instead of population increases
(E) is from conversions rather than increasing the population

[GMATGuruNY]

South Korea has witnessed the world's most dramatic growth of Christian congregations; church membership is expanding by 6.6 percent a year, fully two-thirds of the growth coming from conversions rather than the population increasing.

(A) coming from conversions rather than the population increasing
(B) coming from conversions rather than increases in the population
(C) coming from conversions instead of the population’s increasing
(D) is from conversions instead of population increases
(E) is from conversions rather than increasing the population

A: from conversions rather than the population
Here, CONVERSIONS are illogically compared to THE POPULATION.
Eliminate A.

C: conversions instead of the...increasing
Here, CONVERSIONS are illogically compared to THE INCREASING.

D and E: Church membership is expanding by 6.6 percent a year, fully two-thirds of the growth is from conversions.
Here, a comma incorrectly connects the blue sentence to the red sentence.
If a comma can be replaced by a period, the answer choice is WRONG.
This error is known as a COMMA SPLICE.
Eliminate D and E.

The correct answer is B.