Subject: mathqa
Question: concentrated apples juice comes inside a cylinder tube with a radius of 2.5 inches and a height of 15 inches . the tubes are packed into wooden boxes , each with dimensions of 11 inches by 10 inches by 31 inches . how many tubes of concentrated apples juice , at the most , can fit into 3 wooden boxes ?
Option: 
A: 48 .
B: 36 .
C: 42 .
D: 24 .
Answer: D