The initial substitution of x = a yields the form . Simplify the function algebraically, or use a table or graph to determine the limit. If necessary, state limit does not exist. x- + 3x - 378 lim x-+18 x- - 324 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. 2 + 3x - 378 O A. lim = (Type an integer or a simplified fraction.) x-+18 x - 324 O B. The limit does not exist