Definitely B.
Some might not think $200 in a year profit [($100 X 12 months) - $1000 cost] is much to sneeze about, but that is still a 20% gain on your investment in one year.
If the traffic is stable, that's another $1200 in year number two for a total of $2400 in income. $1400 profit off a $1000 investment in two years time equates to 140% actual return.
That's the forumal to success, if you can repeat it. And, of course, if you can be fairly certain the traffic will not disappear.