Question

Which of the following states Bernoulli’s principle?

Answer 1

The correct answer is B. As speed of a fluid increases, the pressure within decreases.
Using formulas, Bernoulli's principle can be written as 
$p+ \frac{1}{2}\rho v^2 + \rho g h=cost.$
where p is the pressure of the fluid, $\rho$ its density, v its speed, and h its elevation above a reference level.
Assuming h does not change, we can see that if the speed v increases, the pressure p must decrease in order  to keep constant the sum of the three terms.