Correct option is B
Invar is a nickel-iron alloy known for its uniquely low coefficient of thermal expansion, which is almost zero. This property makes it highly valuable in applications where dimensional stability is crucial, such as in precision instruments, clocks, and other devices that require minimal expansion and contraction with temperature changes. In contrast, materials like stainless steel, silver, and selenium exhibit a higher coefficient of expansion, making them more susceptible to thermal expansion and contraction.
