Question $1$

Your Skin Care Formulation Director has come to you and asked if you can formulate a sarcosinate$-$

based facial cleanser for launch next year as part of a new skin care brand. For this formula, which

will be $23\%$ sodium myristyl sarcosinate, with a pH target of $7\mathrm{.}0($with a $pH$ range of $6\mathrm{.}5-7\mathrm{.}5),$

Marketing would like for you to use one of these three preservative systems:

$0\mathrm{.}3\%$ phenoxyethanol $+0\mathrm{.}3\%$ benzyl alcohol $+0\mathrm{.}1\%$ phytic acid $($Option $1)$

$0\mathrm{.}5\%$ phenoxyethanol $+0\mathrm{.}35\%$ sodium benzoate $+0\mathrm{.}1\%$ phytic acid $($Option $2)$

$0\mathrm{.}5\%$ phenoxyethanol $+0\mathrm{.}15\%$ caprylhydroxamic acid $+0\mathrm{.}1\%$ phytic acid $($Option $3)$

Which of the three preservative systems would you choose for use in this cleanser?

Why did you choose that option?