The number of geese in a flock increases so that the difference between the populations in year n \plus{} 2 and year n is directly proportional to the population in year n \plus{} 1. If the populations in the years 1994, 1995, and 1997 were 39, 60, and 123, respectively, then the population in 1996 was
<spanclass=′latex−bold′>(A)</span>81<spanclass=′latex−bold′>(B)</span>84<spanclass=′latex−bold′>(C)</span>87<spanclass=′latex−bold′>(D)</span>90<spanclass=′latex−bold′>(E)</span>102