Change $5\frac{3}{4}$ to an improper fraction. 

 

Given:

The fraction  $5\frac{3}{4}$.

We have to convert it into an improper fraction.

$5\frac{3}{4}$ is a mixed fraction. To convert it into an improper function, we will multiply the denominator that is  $4$ with the whole number that is $5$ and then we will add the numerator that is $3$ to the product to get the numerator and the denominator will remain the same.
So, the improper fraction for $5\frac{3}{4}$ will be:

$\frac{\left(4\times 5\right)+3}{4}=\frac{23}{4}$

Hence, option B is correct.