Read the passage and answer the question. Like many small animals, the bat is nocturnal; unlike most of its relatives, however, its front legs are modified to form wings. Because it flies at night, the bat does not rely on its eyes to see, but rather on its highly developed ears. The bat emits sound waves that bounce off objects that lie in flight path. The bat's ears detect the reflected sound waves and the bat swerves to avoid the obstacle. Other mammals, such as whales, use a similar system to navigate the ocean. Human beings have developed mechanical sonar systems for use in ships and submarines. 5 Select the correct answer. What does the author imply in this paragraph? A. Bats can fly.
B. Sonar systems allow animals to "see" using their ears.
C. Small animals are nocturnal.
D. Whales are similar to bats.