Particulate Matter Varies in Size, and the Size Determines the Site

Particulate matter varies in size, and the size determines the site of the deposition in the respiratory system. This means:

A) The larger the particulate, the more hazardous it is.
B) The smaller the particulate, the more hazardous it is.
C) The size of the particulate is not important.
D) The lungs and dust masks can take care of the particulates.