The overall change in enthalpy of a reaction depends only on the reactants and the products. the path that is taken from the reactants to the products. the reactants and the catalysts only. the reactants, the products, and the catalysts.

A. the reactants and the products

Explanation:

i just took the test edg2020

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

i think that the answer is c