QUESTION $8$

A typical license plate number in Abu$-$Dhabi consists of $5$ digits. How many different license plate numbers are possible that start

with $1?($For Example: The numbers $10000,12341,10054,....$ meet the criteria as they start with $1.$ However, the number $20013$ is not

counted as it starts with $2$ instead of $1)$

a$.10000$

b$.9999$

c$.100000$

d$.99999$