In DeltaABC, a straight line parallel to...

In `DeltaABC`, a straight line parallel to `BC` intersects the sides `AB` and `AC` at the points `L` and `M`. If the length of `AM` be thrice of the length of `AL`, then `BL:CM=`

A

`1:2`

B

`1:3`

C

`2:3`

D

`3:1`

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