How does the size of an anthill relate to conditions inside the nest?

The anthill is stated is fabricated and kept up by armies of specialist ants, who convey minor bits of earth and rocks in their mandibles and store them close to the exit of the province. 
The greater the hill of the ant colony dwelling place is and the more ground it covers implies it retains more sunlight based warmth. The state of the home underneath is hotter thus.

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The right answer is c.sandstone.