To find out how much Isabelle will pay each month, you can divide the total cost of the bike by the number of months she will be paying.
Total cost of the bike: $1,149.79
Number of months: 6
Monthly payment = Total cost / Number of months
Monthly payment = $1,149.79 / 6 ≈ $191.63
Since the options given are in increments of $100, $200, $250, and $300, the amount closest to her monthly payment of approximately $191.63 would be $200.
So, the answer is $200.