A fluid exert pressure:
(A) only downwards
(B) only upwards
(C) in all direction
(D) fluids do not exert pressure

Hint: The fluid is the substance which continuously changes its shape and it does not have a permanent shape. Generally, the gas substance and the liquid substance are called fluids. And in other words, the substance which flows in the medium is called fluids.

Complete answer:
These properties are ordinarily an element of their powerlessness to help a shear pressure in static balance. Interestingly, solids react to shear either with a spring-like re-establishing power, which implies that misshapenness are reversible, or they require a specific beginning pressure before they distort (see pliancy). Solids react with re-establishing powers to both shear stresses and to typical anxieties—both compressive and elastic. Interestingly, ideal liquids just react with re-establishing powers to ordinary burdens, called pressure: liquids can be exposed to both compressive pressures, compared to positive weight, and to tractable pressure, relating to negative weight.
The two solids and fluids likewise have rigid qualities, which when surpassed in solids makes irreversible disfigurement and break, and in fluids causes the beginning of cavitation. The two solids and fluids have free surfaces, which cost some measure of free energy to shape. On account of solids, the measure of free energy to frame a given unit of surface zone is called surface energy, though for fluids a similar amount is called surface strain. The capacity of fluids to stream brings about various conduct because of surface strain than in solids, albeit in harmony both will attempt to limit their surface energy: fluids will in general frame adjusted beads, while unadulterated solids will in general shape precious stones. Gases don't have free surfaces, and unreservedly diffuse.
The pressure is exerted by the fluids due to their weight. The pressure of the fluid is related to the force of the fluid and the area of the fluid. And it exerts pressure in all directions. And it is given by $P = \dfrac{F}{A}$, where $P$ is the pressure, $F$ is the force and $A$ is the area.

Hence, the option (C) is the correct answer.

Note:
The pressure of the fluid is directly proportional to the force of the fluid and the pressure of the fluid is inversely proportional to the area of the fluid. As the force of the fluid increases, then the pressure of the fluid is also increasing.