Question

a precious metal is
a. an element with super and electric and thermal conductivity, high luster, and sensitivity.
b. a highly sought after dense, shiny, soft precious metal that has been used as money for many centuries.
c. an highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity.
d. a soft, sensitive, and lustrous element with the highest conductivity of any element.
please select the best answer from the choices provided
o a
o b
o c
o d

Explanation:

A precious metal is generally defined as a highly valuable element with properties like high conductivity (electric and thermal), luster, etc. Option B is circular (defines "precious metal" as a "precious metal"). Options A and D have issues: A has grammar errors and "sensitivity" is not standard; D is too specific ("highest conductivity" refers to silver, not all precious metals). Option C, despite minor grammar issues, best captures the general definition.

Answer:

C. an highly valuable element with super and electric and thermal conductivity, high luster, and sensitivity.