ANS:A - stiffness

Young's modulus of a material is the measure of its stiffness. Young's modulus, also known as the modulus of elasticity, is a mechanical property that quantifies the stiffness or rigidity of a material. It measures the resistance of a material to deformation under an applied force, specifically tensile or compressive stress. Materials with a high Young's modulus are stiffer and require more force to deform, while materials with a low Young's modulus are more flexible and deform more easily under the same load. Young's modulus is an essential parameter in engineering and materials science, as it helps determine the behavior of materials under various loading conditions, such as tension, compression, bending, and torsion. It is typically expressed in units of pressure, such as pascals (Pa) or gigapascals (GPa).