Task: Question Answering
Input (English): Problem: in a certain supermarket , a triangular display of cans is arranged in 9 rows , numbered 1 through 9 from top to bottom . each successively numbered row contains 3 more cans than the row immediately above it . if there are fewer than 120 cans in the entire display , how many cans are in the six row ? 
Options: a ) 12 , b ) 14 , c ) 16 , d ) 18 , e ) 20
Output (English): c