Bart Is Sexually Active but Not in a Long-Term Relationship

Bart is sexually active but not in a long-term relationship. Will he practice safe sex? The theory of reasoned action predicts 'yes' if Bart:

A) thinks using condoms in sexual encounters is a good idea.
B) actually says that he will use a condom in an imminent sexual encounter.
C) thinks the social norm popular among his peers favours safe sex.
D) all of the above in combination.