XSCIENCE:
Design an experiment to provide
evidence that gravity puls things
together and depend on the mass of
the interacting objects. What is
your independent variable,
dependent variable, controls, and
procedures?

B? i feel like this is a trick  

Ithink iit might be

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist