On January 31, an entity's balance sheet showed net assets of $1,025 and liabilities of $225 Owners' equity on January 31 was:
A) $ 800
B) $1,025
C) $1,250
D) $ 225

You balance sheet is the same as your accounting equation:

Assets = Liabilities + Equity

All you need do is insert the numbers they gave you and do the math to figure out the missing number.