timelines move from left to right
from 0 to infinity
from smaller to bigger
a goal achieved in x years will be to the right of one achieved in y years
one way is to pick a random number
let's say it is year 0
a goal that is achieved in year 6 is to the right of a thing achieved in year 5
a goal achieved in 6 years os to the right of a goal that is achieved in 5 years
so the left number has to be bigger than the left number
D is the answer