Which variable is discretea time to finish a raceb temperature at start of race c number of runner in race d length of race in kilometers

Answer:C. The number of runners in a raceStep-by-step explanation:Variables can be widely be classified as either discrete or continuous. A continuous variable is a variable which can take on any value within its domain. A continuous variable can take on fraction of units. Examples of continuous variables include;time to finish a race - it can be 10.5 sec or 35.56 sectemperature at start of race - the temperature could be 25.5 K, or 45.57 Klength of race in kilometers - the length could be 20 km, 22.45 km or 38.8 kmAll the above variables can be measured in fraction of units and are thus continuous in nature.On the other hand, a variable is said to be discrete if it can take on only integer values. An example in this case would be ;the number of runners in a race. We can only have, 10, 45, 600, 565 and so on runners but never a fraction of a runner.