Which is a type of clouds that creates a uniform, flat gray sky?

a) cumulonimbus
b)cirrus
c) cumulus
d) stratus

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"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide