A zoologist wants to know what color bird feeder humming birds prefer. He puts a 300 mL of a sugar water mixture in 3 humming birdfeeders that are the same in every way except for the color. One is blue, the second is red, and the third feeder is yellow. After observing the humming birds visit his feeders for one week, he measures how much of the sugar water mixture left in each feeder. He sees that the red feeder has the least amount of the sugar mixture left. He concludes that humming birds prefer to eat from red feeders. What is the dependent variable?a. The color of thefeedersb. The yellow humming bird feederc. The amount of sugar water left in each feederd. The number of feeders