Is

To determine whether the expression

\[
\dfrac{36}{25} \cdot \sqrt{11}
\]

is rational or irrational, let's analyze each component of the expression:

1. **Rational Number**: The fraction \(\frac{36}{25}\) is a rational number because it is the quotient of two integers (36 and 25).

2. **Irrational Number**: The square root \(\sqrt{11}\) is an irrational number because 11 is not a perfect square.

Now, when we multiply a rational number by an irrational number, the result is always irrational. Therefore,

\[
\dfrac{36}{25} \cdot \sqrt{11}
\]

must be irrational.

Thus, the correct choice is:

**(Choice B) Irrational**.