Answer:
B. Emulsion
Explanation:
Emulsions are mixtures of oil and water solutions. They are used in the treatment of ophthalmic challenges such as conjunctivitis, and are aimed at reaching the target site.
Emulsions help to improve permeability of the drug in the cornea. They also help to retain the drug for longer times in the eye. These two basic functions will help to make the drug more effective.