Im pretty sure it’s b, but I’m not so sure.. can someone help?

Electricity powered home and factories. how did electricity change americans' lives

Which is these is not a benefit of parallel structure? a)clarity b)classification c)emphasis d)balance

Evaluate the argument in president kennedy’s inaugural address for sacrificing oneself for the greater good of humanity. is this argument convincing? in what ways can we see the legacy of his request in this word today.