Nicole Frail People say that Alexander Graham Bell 's magnum opus was the telephone. This great achievement occurred when he made the first phone call on March 10, 1876 . On that day, Bell placed one phone in a room with his assistant, Thomas Watson. Bell sat with a second phone in another room. Watson pressed the receiver against his ear and was surprised when he heard Bell say his name. It worked! Bell 's hard work had finally paid off!

The Latin phrase magnum opus MOST LIKELY means

A.
work of genius

B.
downfall

C.
accidental invention

D.
communication device