When Calculating the Uncertainty Associated with Molar Mass,which of the Following

Multiple Choice

When calculating the uncertainty associated with molar mass,which of the following statements are TRUE? I Uncertainty in the mass of n identical atoms = n  (uncertainty in atomic mass for one atom. )
II Uncertainties for different elements are dependent.
III The uncertainty for the sum of the masses of different elements is calculated using the equation .
IV When summing the masses of different elements,the uncertainties for the mass of different elements are propagated as random errors.

A) I,II,and III
B) I and III
C) II,III,and IV
D) I and IV
E) II and III