If k(x) = 5x – 6, which expression is equivalent to (k + k)(4)?

If k(x) = 5x – 6, which expression is equivalent to (k + k)(4)?

a. 5(4 + 4) – 6
b. 5(5(4) – 6) – 6 54 – 6 + 54 – 6
c. 5(4) – 6 + 5(4) – 6