Final answer:
The mass of a substance which follows a continuous exponential growth model will increase rapidly over time.
So, The option D is the correct answer.
Step-by-step explanation:
The mass of a substance which follows a continuous exponential growth model will increase rapidly over time. This type of growth occurs when the quantity of the substance doubles at a constant rate. As time goes on, the rate of growth becomes increasingly faster, resulting in a rapid increase in mass.
So, The option D is the correct answer.