There are 13 species of finches living on the Galápagos Islands. According to the current scientific hypothesis,
these finches evolved from a species of finch that lived on
the mainland of South America. A few finches must have
become lost and landed on one of the islands. These
finches had to survive in a new environment. Different
pressures caused this new population of finches to evolve
differently from the original population. Eventually, the
populations became so different that they could no longer
produce offspring together.
Which of the following signal words best starts the
sentence that begins with "A few finches must
have"?
A. First
O B. Eventually
O C. Meanwhile
O D. Before