According to Bernoulli's equation P/ρg + h + v²/2g = constant, The terms A, B and C are generally called respectively:

The correct option is: Pressure head, gravitational head and velocity head

Bernoulli's equation represents the conservation of energy for a steadily flowing, incompressible, non-viscous fluid. The equation is expressed as:

$\frac{P}{\rho g}+h+\frac{v^2}{2g}=\text{constant}$

Each term in this equation represents energy per unit weight of the fluid. Because energy per unit weight has the dimensions of length, these terms are traditionally referred to as "heads":

Term A:
$\frac{P}{\rho g}$
This represents the pressure energy per unit weight of the fluid and is generally called the pressure head.

Term B:
$h$
This represents the potential energy per unit weight of the fluid due to its height in a gravitational field and is generally called the gravitational head (or elevation head).

Term C:
$\frac{v^2}{2g}$
This represents the kinetic energy per unit weight of the fluid due to its velocity and is generally called the velocity head.

Therefore, the terms A, B, and C are respectively called the pressure head, gravitational head, and velocity head.