What are the key figures and leaders in Christianity and Islam, and who are considered prophets?

It's a bit hard to read all the questions clearly, especially the first one. I'll answer the ones I can decipher.

Question 2: The leader of Christians is...
The central figure and leader of Christianity is Jesus Christ.

Question 3: Who founded the Islamic religion?
The Islamic religion was founded by Prophet Muhammad.

Question 4: The leader of Islamic religion is...
The leader and founder of the Islamic religion is Prophet Muhammad.

Question 5: Which of the following was a prophet?

a) Jesus

b) Moses

c) Elijah

d) All of the above

All three figures listed (Jesus, Moses, and Elijah) are considered prophets in various Abrahamic religions.
The correct option is d) All of the above.