Can someone help me pls Which one of the following statements is true?

A. The input value is the dependent variable.

B. The input value is the independent variable.

C. The output value is the independent variable.

D. The output value can be the dependent variable or the independent variable, depending on the situation.

No links pls. Thank you for understanding (:

Robert plans to make a box-and-whisker plot of the following set of data. 27, 14, 46, 38, 32, 18, 21 find the lower quartile, the median, and the upper quartile of the set? lower quartile: 19.5; median: 29.5; upper quartile: 42 lower quartile: 14; median: 27; upper quartile: 46 lower quartile: 18; median: 27; upper quartile: 38 lower quartile: 16; median: 29.5; upper quartile: 42