The best option to deter identity theft from the choices provided is:
B: shred financial documents after you use them.
Shredding documents helps ensure that sensitive information does not fall into the wrong hands.
The other options (A, C, and D) would increase the risk of identity theft because sharing personal information online or over the phone and throwing away paperwork with personal information can expose you to potential theft or fraud. It's important to protect your personal information diligently.