It would be elimination (C) because 7x and -7x can be eliminated into 0.
  7x + 5y = 19   -7x - 2y = -16       3y = 3       3   3        y = 1   7x + 5y = 19 7(1) + 5y = 19   7 + 5y = 19  - 7       - 7      5y = 12       5    5       y = 2.4    (x, y) = (1, 2.4)