Which of the Following Best Describes Constant Cost Industries

Which of the following best describes constant cost industries?

A) They significantly increase the demand for inputs when expanding output, and, as a result, input prices rise.
B) They do not use inputs in sufficient quantities that a change in industry output would affect the prices of the inputs.
C) They use large portions of the total supply of specialized resources.
D) They are those in which the cost curves of individual firms shift upwards as industry output expands.