How many whole numbers are less than k, If k is a whole number

If k = 3, then the whole numbers less than 3 are 2, 1, and 0.  There are 3 whole numbers less than 3.

If k = 10, then the whole numbers less that 10 are 9, 8, 7, 6, 5, 4, 3, 2, 1,  and 0.  That's 10 whole numbers less than 10.

It appears that there are k whole numbers less than the whole number k.

answer

the correct answer is

explanation

the given function is

the excluded values are obtained by solving:

we factor to obtain:

the excluded values are

c

step-by-step explanation: