When we were having a meeting, the director（）the bad news by telephone.

A.was telling 

B.was told

C.could tell 

D.would tell

5kg、容积为10.0L的容量筒装满干燥石子后的总质量为18.5kg。若向筒内注入水，待石子吸水饱和，为注满此筒共需注入水4.28kg。将上述吸水饱和的石子擦干表面后称得总质量为18.7kg(含筒重)。求该石子的表观密度和堆积密度。