Final answer:
Density is mass divided by volume. If mass increases while volume stays the same, density will increase.
Step-by-step explanation:
Density is a fundamental property of materials that is defined as the mass per unit volume of a substance. The formula for density is given by:
p = m / V,
where p (rho) stands for density, m is the mass, and V is the volume. According to the definition of density, if the mass (m) of an object is increased while the volume (V) remains constant, the density (p) of the object will increase. So, the correct answer to the question is A) Density will increase.