Company liablity of the year

A company began the year with Assets of $100,000, Liabilities of $20,000 and Stockhoder’s equity of $80,000. During the year Assets increaseds $55,000 and stockhoder’s equity increased $20,000 What was the change in Liabilities for the year? a) Increase of $75,000 b) Increase of $35,000 c) Decrease of $75,000 d) Decrease of $35,000