Answer:
option B
Explanation:
P is currently at a height of 3 cm. in 2 days it'll have grown 2 cm (0.5 x 2), meaning it'll measure 5 cm.
Q is currently at a height of 5 cm. in 2 days it'll have grown 3 cm (1.5 x 2), meaning it'll measure 8cm.
8-5=3
Q will be 3 cm taller than P