A man had two blacksmiths for his neighbours. Their names were Pengu and Shengu. The man was greatly troubled by the noise of their hammers. He decided to talk to them. The next day he called both of them and offered Rs. 100 each, if they found new huts for themselves. They took the money and agreed to find new huts for themselves. The next morning he woke up again to the sound of their hammers. He went out to see why the blacksmiths hadn't found new huts and he discovered that Pengu and Shengu had kept their promise. They had exchanged their huts.
The man came to know that

Options

A. the blacksmiths were not in their huts
B. the blacksmiths had exchanged huts
C. the blacksmiths were going away
D. the blacksmiths had not kept their promise