A cluster of furuncles, or boils, is called a carbuncle. The cluster is caused by bacterial infection, most commonly with Staphylococcus aureus or Streptococcus pyogenes.
I think it is b or d, sorry I can't give you 1 answer.
The best answer is B. <span>Photochemical smog tends to form over sunny cities. </span><span>The main components of smog are nitrogen oxides,
volatile organic compounds, peroxyacytyl nitrate and tropospheric ozone. Smog
is a mixture of air pollutants which are altered due to exposure to sunlight. </span>
The answer is C, although local levels of the legislative bodies focusses most on this, the other levels you mentioned under certain circumstances will pass or accept these laws as well.
