A Fictional Animal, the Tribble, Reproduces in Synchrony at Regular $\lambda$

A fictional animal, the tribble, reproduces in synchrony at regular intervals. When the logarithm of a particular tribble population was plotted against time, the result was a straight and increasing line. Which statement about the tribble population is false?

A) The tribble population is increasing in size geometrically.
B) The $\lambda$ of the tribble population is constant and greater than 1.
C) If the actual population size were plotted against time, the result would be an increasing J-shaped curve.
D) r = 0.