Marley came to Scrooge's home because he was on a mission. He went to great trouble to arrange this visit with his old partner because: a He hadn't been honest with Scrooge about the business they shared. b All ghosts come back to haunt the people they knew when they were alive. c He learned his lesson too late and wanted to save Scrooge from an afterlife of misery. d He yearned to visit with him one more time.

He went to great trouble to arrange this visit with his old partner because:

C. He learned his lesson too late and wanted to save Scrooge from an afterlife of misery.

Explanation:

“It is required of every man,” the Ghost returned, “that the spirit within him should walk abroad among his fellowmen, and travel far and wide; and if that spirit goes not forth in life, it is condemned to do so after death. …”

The lines above are said by Jacob Marley in Stave One of "A Christmas' Carol". Marley is now a ghost and has come to visit his old friend, Scrooge. According to Marley, people are supposed to evolve while they are alive. They are supposed to become better, kinder, more empathetic toward others. In case they fail to do so, they are bound to do it after death.

That is why he has decided to visit Scrooge. He wants his friend to avoid having the same fate as himself. Scrooge is a cold-hearted man, so Marley wants him to learn his lesson before death and become a better person.