The LM (Lagrange Multiplier)test Generates a Test Statistic N $\chi$ ²_(S-1)

The LM (Lagrange Multiplier) test generates a test statistic N * R² ~ $\chi$ ²_(S-1) .Where is the R² in the test statistic measured?

A) the original econometric model when estimated using the White correction technique
B) the average from all the auxiliary regressions estimated with each explanatory variable as a function of the other explanatory variables
C) the original econometric model before any test of heteroskedasticity has been performed
D) the auxiliary regression of residuals as a function of the explanatory variables generating the heteroskedasticity