When lava cool’s very slowly, the crystals of the rocked formed will be- A. small
B. large
C. cemented
D. foliated

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Explanation:

Large, I think.

Explanation:

I don't know if this is right but,

"When lava cools very slowly the crystals of the rock formed will be?

When magma cools underground, it cools very slowly and when lava cools above ground, it cools quickly. When magma and lava cool, mineral crystals start to form in the molten rock. Plutonic rocks, which cool slowly underground, have large crystals because the crystals had enough time to grow to a large size."

http://ratw.asu.edu/aboutrocks_igneous.html#:~:text=When%20magma%20cools%20underground%2C%20it,grow%20to%20a%20large%20size.

I hope this is correct.