"antenna" in the third paragraph probably means ______.

A．cell phones and cancer are not linked
B．people shouldn't use cell-phones in a long-term
C．using cell-phones is one cause for cancer
D．cell-phones are not harmful

A．people have no need to worry cell phones can cause cancer
B．it is not dangerous for long-term cell-phone users
C．cell-phone users reassure them about using cell-phones
D．they found a slightly increased risk for a rare type of brain cancer