Tick (✓) the correct answer:

Tick (✓) the correct answer:

The sum of (6a + 4b − c + 3), (2b − 3c + 4), (11b − 7a + 2c − 1) and (2c − 5a − 6) is

(a) (4a − 6b + 2)

(b) (−3a + 14b − 3c + 2)

(c) (−6a + 17b)

(d) (−6a + 6b + c −4)