Which privileged level is … by default? for user exec mode

A.
0

B.
1

C.
2

D.
5

E.
15

Explanation:
BD
User EXEC mode commands are privilege level 1
Privileged EXEC mode and configuration mode commands are privilege level 15.
Source: http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/command/reference/fsecur_r/srfpass.html