instruction:
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'.
question:
Problem: the curved surface of a sphere is 64 π cm 2 . find its radius ? 
Options: ['a ) 8', 'b ) 3', 'c ) 4', 'd ) 9', 'e ) 7']
answer:
c


question:
Problem: if the horse can run 10 miles / hour , how many days would it take for a horse to run from new york city to washington . d . c . ? ( 240 miles from nyc to d . c . ) 
Options: a ) 0.6 , b ) 0.8 , c ) 1 , d ) 1.2 , e ) 1.4
answer:
c


question:
Problem: if 20 typists can type 42 letters in 20 minutes , then how many letters will 30 typists working at the same rate complete in 1 hour ? 
Options: a ) 189 , b ) 72 , c ) 144 , d ) 216 , e ) 400
answer:

a