Positive Deviation from Raoult's Law:
When two components in a liquid mixture have stronger intermolecular forces between themselves than with the solvent, they show a positive deviation from Raoult's law. In such cases, the vapor pressure of the mixture is higher than predicted by Raoult's law.

Explanation:
Benzene and Methanol:
- Benzene and methanol are both organic compounds.
- Benzene exhibits weak London dispersion forces between its molecules, while methanol exhibits hydrogen bonding.
- The intermolecular forces between benzene and methanol are weaker than the forces between the same molecules, resulting in a positive deviation from Raoult's law.
- The stronger hydrogen bonding in methanol causes the vapor pressure of the mixture to be higher than predicted by Raoult's law.

Water and Hydrochloric Acid:
- Water and hydrochloric acid are both polar compounds.
- Both water and hydrochloric acid exhibit hydrogen bonding.
- The intermolecular forces between water and hydrochloric acid are stronger than the forces between the same molecules, resulting in a negative deviation from Raoult's law.
- The stronger hydrogen bonding between water and hydrochloric acid causes the vapor pressure of the mixture to be lower than predicted by Raoult's law.

Water and Nitric Acid:
- Water and nitric acid are both polar compounds.
- Both water and nitric acid exhibit hydrogen bonding.
- The intermolecular forces between water and nitric acid are stronger than the forces between the same molecules, resulting in a negative deviation from Raoult's law.
- The stronger hydrogen bonding between water and nitric acid causes the vapor pressure of the mixture to be lower than predicted by Raoult's law.

Acetone and Chloroform:
- Acetone and chloroform are both organic compounds.
- Acetone exhibits dipole-dipole interactions, while chloroform exhibits weak London dispersion forces.
- The intermolecular forces between acetone and chloroform are weaker than the forces between the same molecules, resulting in a positive deviation from Raoult's law.
- The weaker forces between acetone and chloroform cause the vapor pressure of the mixture to be higher than predicted by Raoult's law.

Therefore, the correct answer is option 'B' - Benzene and methanol.