What Privacy Risk Is NOT Mitigated by the Use of Encrypted

What privacy risk is NOT mitigated by the use of encrypted computation to target and serve online ads?

A) The ad being served to the user may not be relevant.
B) The user's sensitive personal information is used to display targeted ads.
C) The personal information used to target ads can be discerned by the server.
D) The user's information can be leaked to an advertiser through weak de-identification techniques.