A bar with a diameter of 494 mm and a length of 1.5 m has a square hole with 177.8 mm sides through its axis. If the mass of the bar is 2027.1 kg, find the relative density of this material.
A. 10.7
B. 9.77
C. 9.77 kg/m³
D. 8.44
E. 8.44 kg/m³
Answer: D