Select the correct option to test your answer:
Correct Answer: Option B ($${\text{SAR}} = \frac{{{\text{N}}{{\text{a}}^ + }}}{{\sqrt {\frac{{{\text{C}}{{\text{a}}^{2 + }} + {\text{M}}{{\text{g}}^{2 + }}}}{2}} }}$$)
Verified correct option for Agriculture (Soil Science).