Which of the following is the most important assumption for the capture-recapture method to estimate the size of wildlife populations?

A)All females in the population have the same litter size.
B)More individuals emigrate from, as opposed to immigrate into, a population.
C)Over 50% of the marked individuals need to be trapped during the recapture phase.
D)There is a 50:50 ratio of males to females in the population before and after trapping and recapture.
E)Marked individuals have the same probability of being recaptured as unmarked individuals during the recapture phase.