I'm not sure I completely understand your questions, but let me try answer them as I understand them. 
 
A) Yes, Jesus is the Son of God. He is the Only Beggotten of the Father. The Bible and other LDS scriptures make this very clear. 
 
B) Yes, Jesus has ascended to his (our Our Heavenly) Father. We do not know about the Holy Ghost. 
 
C) Yes, we believe that Martin Luther, etc were key parts of Heavenly Father's plan for the restoration of the Gospel. 
 
Here are some conference addresses relating to item C: Link

As jett stated your question is a little confusing so I am misunderstanding please correct me! 
 
A) Jesus Christ is the Son of God, he is also the Only Begotten of the Father. This means he is the only person who was conceived by the power of God. Christ spirit is a child of God (like everyone else) but he is also the literal Son of God in the flesh.  
 
B) Christ is on the right hand of the Father in the Celestial Kingdom (the highest glory in Heaven). It can be assumed that the Holy Ghost does reside there as well when he is not revealing the will of God to us on Earth (there is no scriptural evidence to support this though). 
 
The belief that there is One God with three persons is not accepted by the LDS Church though. This doctrine called the Trinity is not scriptural at all. There is only One God and he is God the Father supreme ruler. Jesus Christ is an exalted being of flesh and bones like his father (also called a god by Mormons) but he is not the One God.  
 
Christ submits to the will of the father just like we do. We only worship God not Jesus Christ. Jesus Christ is our Creator (through God's power), Savior, Lord, King, and Mediator with the Father. He is a god (exalted being) but he is not God, only the Father is God.  
 
I hope this is not too confusing for you.  
 
C) Yes, we believe that the works of the Roman Catholic Church, the Protestant Reformation, and all other religions movements were part of God's plan to restore the one true Church of Jesus Christ to the Earth through the Prophet Joseph Smith in 1830.  
 
Without the preperations done by these men there could of be no restoration and the world would still be without the light of Christ and the revelations of God. Thankfully though our God is a merciful God and has restored the Church of Jesus Christ that was lost when the Apostles were persecuted and killed in the first century A.D! 
 
Thank you for your question Robert!  
 
I hope my answer proved helpful to you!