Jason had ¾ pound of Salami.
 He used 1/3 of it for sandwhich, now find the number of pound of salami left.
 => ¾ - 1/3 
 => ¾ - 1/3, since the given equation contains different denomination, find the least common denominator
 => so the LCD is 12
 => ¾ - 1/3 = 9/12 – 4/12
 => 9/12 – 4/12 
 => 5/12
 Thus, the answer is letter C. 5/12 pounds is left to Jason’s Salami.