If it’s chemistry then In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
an element's name, chemical symbol, atomic number, atomic mass.
IDK what you are even asking for
The reactant is what you begin with.
The product is what you end up with (so the answer is B)
