The (main) thing that you would want to remember would be that, 0.4 is .4 of 1. So, when looking at your options, we would want to find something that is pretty much almost half of 1.
For example: 0.5 is half 1, so in this case, 0.4 is almost half of 1, and we would want to find an option that would be very similar.
Your correct answer would be (option b and option c).
Since there is a 5 to the right of the decimal, you will round the number immediately to the left of the decimal up. So the nearest whole number would be 71.
