The saturation of NaCl at 100 ° C. is 39.8 g / 100 ml.
To calculate the amount of NaCl, Cross-multiplication should be used.
100ml ==> 39.8 grams
600ml ==> 39.8 * 600/100 = 238.8 grams of NaCl in the solution
So the answer should be the one that comes closest to this result is 240 grams.