How the independent variable and dependent variable of your investigation are incorporated into the data table that you will use to record your measurements?
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The dependent variable (height) depends on the independent variable (age). An easy way to think of independent and dependent variables is, when you're conducting an experiment, the independent variable is what you change, and the dependent variable is what changes because of that.

Explanation:

This is what I thought you were looking for. I hope it helped a little :))

Options are as follow,

A. P₄O₁₀
B. PCl₅
C. Ca₃(PO₄)₂
D. KH₂PO₃

Answer;
            The correct option is Option-D (KH₂PO₃).

Explanation:
                   Oxidation number of Phosphorous is calculated as,

As the normal oxidation number of K is +1, H is +1 and O is -2 so,

                                       KH₂PO₃  =  0

0 shows that the molecule is neutral. Now puttion values of all elemnts except P,
 
                                  (+1) + (+1)₂ + P + (-2)₃  =  0

                                  +1 + 2 + P - 6  =  0

                                  +3 + P - 6  =  0

                                  +3  + P  =  +6

                                  P  =  +6 - 3

                                  P  =  +3