Given the task definition and input, reply with output. In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: a ladder learning against a wall makes an angle of 60 with the ground . if the length of the ladder is 19 m , find the distance of the foot of the ladder from the wall .
Options: a ) 9 m , b ) 9.5 m , c ) 10.5 m , d ) 12 m , e ) none
b