Which sentence correctly uses one or more commas to set off a nonrestrictive clause? You will be granted hundred points and you will be marked brainliest! This is very important so please try your best on answering this

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal