Bleeding due to a cut can be stopped by applying ferric chloride solution in the laboratory. This is due to

• Correct answer
  A

  coagulation of negatively charged blood particles by Fe ${ }^{3+}$ ions.
• B

  coagulation of positively charged blood particles by $\mathrm{Cl}^{-}$ions.
• C

  reaction taking place between ferric ions and the haemoglobin forming a complex.
• D

  common element, iron, in both $\mathrm{FeCl}_3$ and haemoglobin.

Hence, the correct answer is option: 'A'.