Which of the following procedures describes the best method of obtaining the accurate mass of a sample in the laboratory? A. Zero the balance and then weigh the sample on the balance.

B. Use two different balances to weigh the sample and average the two weights together.

C. Check the balance for accuracy using a known weight weigh the sample three times on the balance, and use the average of the three masses.

D. Obtain the mass using a balance, remove the sample, re-zero or tare the balance and then weigh the sample a second time.