The correct option is C A-Lag, B-Exponential, C-Stationary
In most cell systems, the initial growth is slow (lag phase), and it increases rapidly thereafter – at an exponential rate (log or exponential phase). However as the number of cells increase, the nutrient supply starts decreasing. With limited nutrient supply, the growth slows down leading to a stationary phase. This type of growth is represented by the sigmoid growth curve.