Discussion
Lithium niobate is a combination of :
Answer: A
Lithium niobate combines electro-optic, piezo-electric and optical properties.
LiNbO3 is a ferroelectric crystal with a large electro-optic effect, so its refractive index changes with an applied voltage, which is used in high-speed optical modulators. It is strongly piezoelectric, used in surface acoustic wave filters, and it has good nonlinear optical properties for frequency doubling and waveguides.
The other options each name only part of this combination, or add properties such as optical activity or chemical behaviour that are not what makes lithium niobate useful.
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