Answer: C
SYNERGISTIC definition: relating to the interaction or cooperation of two or more organizations, substances, or other agents to produce a combined effect greater than the sum of their separate effects.
C. low humidity , when humidity is low it’s cooler outside which would be the best time for crystalline to form
False because extrusive rocks have fine-grained texture due to the rapid cooling of magna above the earth surface. On the other hand extrusive rocks have course grained texture due to slow cooling of magna beneath the Earth's surface

The answer is...
B. Cooling as the lava runs down the mountain.
Hopefully, this helps you!!
