You can approximate 'e' by substituting large values for n into the expression ____.

The value of 'e' is defined by the following expression:
[tex]e=\lim_{n\to\infty}(1+\frac{1}{n})^n[/tex]That means if we use large values for n in the expression (1 + 1/n)^n, the result will approximate the value of 'e'.
Therefore the correct option is B.