Read the extract given below and answer the questions/complete the statements that follow by choosing the most appropriate options from the given ones:
Without making any noise and with a poker grasped firmly in his hand, the clergyman flung open the door
"Surrender !"
Then to his amazement he realized that the room appeared to be empty. He and his wife looked under the desk, and behind the curtains and even up the chimney. There wasn't a sign of anybody. Yet the desk had been opened and the housekeeping money was missing.
"Extraordinary affair l" the clergyman kept saying for the rest of the day.
The clergyman felt amazed :

Options

A. that there was no one visible in the room.
B. when he saw his wife peeping under the desk.
C. the arrangement of furniture had been disturbed.
D. there was nobody even behind the curtains.