Consider the hypothesis below and answer the question that follows. adding salt to water increases the water’s boiling point. if you performed an experiment to test this hypothesis, which action would introduce confounding variables into your experiment? a. you use distilled water sourced from the same place. b. you add black salt to some specimens and pink salt to others. c. you add equal quantities of salt in all the water specimens. d. you use earthen clay pots to store and boil all the water specimens.