Three solid blocks, each of volume 50cm3, have masses 30g (Block P), 45g (Block Q) and 60g (Block R) respectively. They are gently lowered into a liquid of density 0.8gcm−3. Which statement correctly describes their behaviour?
(a) Blocks P and Q float; Block R sinks
(b) Only Block P floats; Blocks Q and R sink
(c) Block P floats; Block Q remains suspended in the liquid; Block R sinks
(d) All three blocks float