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How and what are the polygonal cracks related to?

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How and what are the polygonal cracks related to?

(a) Directly related to compressive forces

(b) Directly related to tensile forces

(c) Inversely related to tensile forces

(d) Directly related to shearing forces

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This is a very interesting question from Occurrence of Joints topic in division Joints and Jointing of Engineering Geology

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Right answer is (b) Directly related to tensile forces

The explanation is: The polygonal cracks are thought to be directly related to the tensile forces developed during cooling (accompanied by contraction) of hot molten material (lava).

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