Averblio writer wants to write for a new customer called "certified industrial wares," but he doesn't have an idea of what to write about. he sees another post in the customer's queue, reads through that post, then rewrites the information from it and submits his own version. is this plagiarism?

The answer is a, (There must be a change in chemical properties) because in a chemical reaction, new substances are formed.
It's not c since the rule of conservation of mass states that the mass does not decrease or increase since no particles are made or lost. The mass of the products is equal to the mass of the reactants. It's not b or d since there's not ALWAYS a change in physical properties or volume.