Instructions: 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'.
Input: Problem: in what time will a train 120 m long cross an electric pole , it its speed be 121 km / hr ? 
Options: a ) 2.5 , b ) 2.7 , c ) 2.9 , d ) 3.6 , e ) 2.1
Output:
d