When the SELECT output's ms aspect can be one of 100 (from 99.9) or 103 (from 103.23), 100 is closer :-).

I chose the wrong answer because I was thinking of roundoff in 3ms increments instead of in 3.33ms increments (although I should have realized that the choice should then have been between 99 and 102 :-)), so thank you to the questioner!