If the president vetoes a bill, it can still become law if congress overrides the presidents veto with majority

Congress has the ability to override a veto by a two-thirds majority vote.  

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.