This is for science, and it would really if someone could ☺♥

Power  =  (work done)  /  (time to do the work)

                               =  (600 joules)  /  (4 seconds)

                               =      (600 / 4)      joules/second

                               =        150 joules per second

                               =        150 watts 

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.