The Population Explosion During the 18^th Century Across Eurasia Was

The population explosion during the 18^th century across Eurasia was caused by all of the following except

A) warmer climate and better growing conditions.
B) growing immunities to epidemic diseases that had raged during the previous two centuries.
C) availability of new foods and new means to transport them.
D) improved governmental control and the creation of long periods of peace.
E) insignificant improvements in medical hygiene.