The following is true concerning ants:

• A. They have a narrow waist-line and may be winged or wingless
• B. They lack a waist-line and are always winged
• C. They live only underground
• D. They have a broad waist-line and are always wingless

Answer: (A)

Ants show a narrow constricted waist between the thorax and abdomen, called a petiole, which gives them a distinct waist. In ants, wings are not fixed for every individual: workers and soldiers are typically wingless, while the reproductive ants (alates) develop wings for mating flights. This combination—a narrow waist and the possibility of being winged or wingless—is why the statement is accurate. The other ideas don’t fit because ants do have a waist, they aren’t always winged, and they don’t live exclusively underground since many species nest in soil, wood, or above ground.