If Total Liabilities Increased by ¥30,000 and Equity Increased by ¥10,000

If total liabilities increased by ¥30,000 and equity increased by ¥10,000 during a period of time, then total assets must change by what amount and direction during that same period?

A) $¥ 40,000$ decrease
B) $¥ 740,000$ increase
C) $¥ 50,000$ increase
D) $¥ 60,000$ increase