find the first four terms of the sequence given a n + 1 = a n + n

Question

a. -9, -6, -4, 0

b. -9, -7, -4, 0

c. -9, -5, -4, 0

d. -9, -5, -4, -1

Answer 1

If the recursion formula is a_n+1 = a_n + 1 and a₁ = -9, then a₂ = a₁ + 1 = -8. So, none of the choices is correct. Am I misinterpreting the recursion formula??