Suppose a 6th home was tested for carbon monoxide and the results showed a carbon monoxide level of 10.0 ppm. According to the passage, which of the following conclusions can be reached?
A. The residents of Home 6 are highly susceptible to CO poisoning.
B. Home 6 has a poorly adjusted gas stove that should be repaired or removed.
C. The CO levels in Home 6 will not pose any danger to the residents.
D. The CO sensing device is defective and should be replaced.