When $$\frac{{\vartriangle {{\text{X}}_1}}}{{\vartriangle {{\text{X}}_2}}} > \frac{{{\text{P}}{{\text{X}}_2}}}{{{\text{P}}{{\text{X}}_1}}}$$ then we can
A. Do nothing
B. Go to substituting of $${{{\text{X}}_1}}$$ to $${{{\text{X}}_2}}$$
C. Employ any combinating of $${{{\text{X}}_1}}$$ and $${{{\text{X}}_2}}$$
D. Employ only $${{{\text{X}}_2}}$$
Answer: Option C
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