Write the following set in roster form:
$B = \{x : x \text{ is a natural number less than } 6\}$

(N/A) The set $B$ is defined as the collection of all natural numbers less than $6$.
Natural numbers are positive integers starting from $1$.
Therefore,the natural numbers less than $6$ are $1, 2, 3, 4, \text{ and } 5$.
In roster form,we list these elements within curly braces:
$B = \{1, 2, 3, 4, 5\}$