Answer:
(C). an emerging disease.
Explanation:
Emerging disease can be defined as a disease, which has recently infected people of a population or disease whose geographic range or incidences are rapidly increasing in the near future.
Previously, Lyme disease was geographically restricted to to the north-east United States, but now it is spreading significantly to the other regions. This makes it an example of an emerging disease.
Thus, the correct answer is option (C).
