Fill in the Blanks, Respectively, with a Letter (A or B)

Short Answer

Fill in the blanks, respectively, with a letter (A or B) to represent the balance and more or less to describe the precision.
Two students measured the density of a metal block was determined based on mass measurements using the same balance. The results are shown below. If the metal block is gold (density = 21.45 g/mL), student ___________________'s data is ____________________accurate.