If H Floresiensis Were Reunited with H

Multiple Choice

If H. floresiensis were reunited with H. erectus at a much later date but the two populations could no longer interbreed, it would be correct to conclude that

A) H. floresiensis is no longer fertile as a species.
B) the two groups had been isolated for more than 50,000 years.
C) H. floresiensis has become less fit than H. erectus.
D) a reproductive barrier had evolved.