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(A) The modulus of elasticity represents the stiffness of a material,which is determined by the strength of the intermolecular forces.When the tempera

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Decreases

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(A) The modulus of elasticity represents the stiffness of a material,which is determined by the strength of the intermolecular forces.When the temperature of a material increases,the kinetic energy of the molecules increases,causing them to vibrate more vigorously.This increased thermal agitation weakens the intermolecular forces that hold the atoms together.Since the modulus of elasticity is directly related to the strength of these forces,a decrease in intermolecular force strength leads to a decrease in the modulus of elasticity.Therefore,the correct option is $A$.

If the temperature increases,the modulus of elasticity

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