The author above is correct.
Here is a rule that might help you in the future:
“s” is pronounced as /z/ after these voiced consonant sounds and all vowel sounds
/b/ tabs
/d/ cards
/v/ loves
/g/ hugs
/th/ bathes
/l/ girls
/r/ cars
/m/ moms
/n/ men’s
/ng/ sings
/y/ boys
/w/ how’s
Hope this helps,
Susan
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