Early Christians probably observed these practices:
Question 1 options:

A. Baptism
B. Confession
C. Memorial meal
D. All of the above
E. A and C

Most Christians believe in these doctrines:
Question 2 options:

A. Original Sin
B. Last Judgment
C. Trinity
D. All of the above

These are important Protestant doctrines:
Question 3 options:

A. Salvation is possible by grace alone
B. Justification by faith alone
C. Scripture alone is necessary for salvation
D. All of the above
E. A and C