In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Input: Consider Input: Problem: what is the area of a square field whose diagonal of length 16 m ?
Options: a ) 128 , b ) 289 , c ) 200 , d ) 112 , e ) 178

Output: a

Input: Consider Input: Problem: a cubical block of metal weighs 3 pounds . how much will another cube of the same metal weigh if its sides are twice as long ?
Options: a ) 48 , b ) 32 , c ) 24 , d ) 18 , e ) 12

Output: c

Input: Consider Input: Problem: the volume of a certain substance is always directly proportional to its weight . if 48 cubic inches of the substance weigh 112 ounces , what is the volume , in cubic inches , of 84 ounces of this substance ?
Options: ['a ) 27', 'b ) 36', 'c ) 42', 'd ) 64', 'e ) 147']
Output: b