A gardener wants to plant trees in his garden in such a way that the number of trees in each row should be the same. If there are 4 rows or 5 rows or 6 rows, then no tree will be left. Find the least number of trees required.	Choose the correct choice from the following choices
A) 30
B) 60
C) 120
D) 240
E) 480

Rationale: "the least number of trees that are required = lcm ( 4 , 5 , 6 ) = 60 . answer : b"
Answer: B