Answer: c.fad
A fad can be described as a clearly identifiable demand for a style, activity or an interest which is extremely popular for a short-period of time.
It is usually followed only by a group of people.
The demand for this style, activity or interest is high for a very short period of time. During this period, the demand and sales of the product rises significantly.
However, the interest in the product wears out after a short period of time and demand for the product diminishes considerably.