A Laboratory Validates a Method for Weighing Solid Dose Drug

A laboratory validates a method for weighing solid dose drug powders on a single balance used by 4 analysts. They establish the figures of merit shown in the portion of the uncertainty budget shown below.
What is the combined standard uncertainty for this balance in grams rounded to the same number of digits as the balance displays?

A) 0.04
B) 0.71
C) 0.06
D) 0.12
E) none of the above