A curve that is derived by summing horizontally individual demand curves is called a. market supply. b. aggregate supply. c. market demand. d. aggregate demand

The answer is option (C) market demand

Step-by-step explanation:

Supply is the  amount of a given product that a suppliers are willing to offer to the consumer at  given price level at a given period

Individual supply curve is denoted by various levels of output that a single producer produces at various level

The summation of all the individuals supplies market and each one will have different preferences that make their demand curve different from each other.

so, the market demand curve is obtained, the individual demand curves have to be horizontally summated.

The answer is option (C) market demand