Which sentence correctly uses a dash for punctuation?

Responses
A One thing’s for sure she doesn’t want to—face the truth.One thing’s for sure she doesn’t want to—face the truth.
B One thing’s for sure—she doesn’t want to face the truth.One thing’s for sure—she doesn’t want to face the truth.
C One thing’s—for sure she doesn’t want to face the truth.One thing’s—for sure she doesn’t want to face the truth.
D One thing’s for—sure she doesn’t want to face the truth.

B One thing’s for sure—she doesn’t want to face the truth.