Pip's uncontrolled spending habits represent a. an effort to impress herbert. b. his generosity towards providing for his poor family. c. his constant search for material things to raise his social status. d. his need to earn jaggers' approval as a gentleman.

I was not able to find a similar question on the internet, but the following excerpt would lead me to believe that it's Letter D. 

An excerpt "The Great Expectations enter into the story when Mr. Jaggers takes Pip to London to make a gentleman of him." Pip is living the life of a London playboy. He adapts to his new lifestyle, which includes spending money at a great rate to the point that he is a negative influence on Herbert, his best friend. I'd say it's not the letter A since Pip and Herbert have a positive relationship towards each other. It's not letter B also since it didn't mention him helping his family when he was in London. So it can either be C or D.