Which statement provides the best introduction for paragraph 3?
OA. Of the 48 national parks, 36 have been rated as having "moderate" or bad ozone pollution,
which is oftentimes worse than air quality in major cities, so a course of action needs to take
place immediately.
OB. Instead of spending the summer indoors watching television, people should spend the month
of June getting involved in leadership opportunities with groups that protect and enhance
national parks.
OC. In the hustle and bustle of daily life, it can be easy to forget that when it comes to preserving
the beauty of the great outdoors, it will require continued efforts to execute plans that aim to
protect parks.
OD. Many should follow President Theodore Roosevelt's lead, as he signed into effect one of the
first preservation efforts to protect historical landmarks on public lands through the
Antiquities Act in 1906.