When prices are low and availability is high, consumption a. increases b. decreases c. stops d. slows down

The correct answer is - A. increases.

When the prices of certain products are going down, and the general population is able to afford the products without any problem for their economic balance, the consumption is increasing.

It is in the human nature, that when something we like is easily affordable and we like it, we tend to consume it more, even if it's not good for us, and this is exactly what happens all over the world, but mostly in the well developed countries that found ways to make the most desired products much cheaper, and much more affordable.