Victoria is putting down fertilizer in her garden. For every 25 square feet of garden, she needs one pound of fertilizer. Let p represent the number of pounds of fertilizer.
Let g represent the area, in square feet, of garden she covers.

Which correctly names the independent and dependent variables?
independent variable: number of square feet of garden; dependent variable: number of pounds of fertilizer
independent variable: brand of fertilizer; dependent variable: number of pounds of fertilizer
independent variable: number of pounds of fertilizer; dependent variable: number of square feet of garden covered
independent variable: number of square feet of garden; dependent variable: number of people it takes to put down the fertilizer