Angle of Drop of Liquid:
The angle of drop of a liquid refers to the angle at which a liquid droplet spreads out on a solid surface. It is the angle between the solid surface and the tangent to the droplet at its edge.

Adhesion:
Adhesion is the attraction between molecules of different substances. In the context of a liquid droplet on a solid surface, adhesion refers to the attraction between the liquid molecules and the solid surface.

Cohesion:
Cohesion is the attraction between molecules of the same substance. In the context of a liquid droplet, cohesion refers to the attraction between the liquid molecules themselves.

Explanation:
When the angle of drop of a liquid is acute, it means that the liquid droplet spreads out on the solid surface at a small angle. This indicates that the liquid has a strong adhesion to the solid surface.

When a liquid has a strong adhesion to a solid surface, it means that the intermolecular forces between the liquid molecules and the solid surface are greater than the intermolecular forces between the liquid molecules themselves.

In this case, the liquid molecules are more strongly attracted to the solid surface than to each other, causing the liquid droplet to spread out and flatten on the solid surface.

Conclusion:
Therefore, when the angle of drop of a liquid is acute, it indicates that the liquid has a strong adhesion to the solid surface. Hence, the correct answer is option 'A': Adhesion > Cohesion.