Which sentence fails to use correct parallel structure?
a.the teacher reminded his kids that one should not judge others too harshly, too often, or too much.
b.in an effort to balance the budget, the governor slashed taxes, fired many state employees, and took a cut in pay.
c.every day, mrs. lee reads her favorite blogs: moms who want more, being a better mommy, and trouble-shooting parenting.
d.i don't know which is irritating me more right now: the ringing phone, the crying baby, or the dog that won't stop begging at my feet.