Scores on the Evidence$-$Based Reading part of the SAT exam in a recent year were roughly Normal with mean $536$ and standard deviation $102.$ You choose an SRS of $100$ students and average their SAT Evidence$-$Based Reading scores. If you do this many times, the standard deviation of the average scores you get will be close to

a$.102$

b$.102/100=1\mathrm{.}02$

c$.102/$sqrt$(100)=10\mathrm{.}2$