HELP WITH MATH TEST

Variable p is 2 less than variable d. Variable p is also 1 more than variable d. Which pair of equations best models the relationship between p and d? (5 points)

a
p = d + 2
p = d − 1

b
p = d − 2
p = d + 1

c
d = 2p
d = 2p − 1

d
d = 2p
d = 2p + 1