Im not able to see "Standard Profile - No Acct Delete" while selecting profile.

Hello @Rohan Bhavsar

you had probably used this playground for other modules, and created users while taking them. Deactivate this (these) useless active user(s) linked to former modules (setup > users > select a user and deactivate it) to free some licenses and be able then to create a new user. Create a brand new playground and take the challenge again if you are still stuck / unsure about the users to deactivate. 

Eric