Task: Question Answering
Input (English): Problem: an engineer designed a ball so that when it was dropped , it rose with each bounce exactly one - half as high as it had fallen . the engineer dropped the ball from a 16 - meter platform and caught it after it had traveled 45 meters . how many times did the ball bounce ? 
Options: a ) 5 , b ) 4 , c ) 7 , d ) 8 , e ) 9
Output (English): b