Which of the following is true regarding a restrictive adjectival clause? a. it will follow a proper noun. b. it will typically include the relative pronoun which. c. it will be set off by commas. d. it will follow a general noun and is not set off by commas.

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