Which of the following is an example of discriminatory advertising under the Federal Fair Housing Law?

The correct answer highlights a clear violation of the Federal Fair Housing Law, which prohibits discrimination based on religion among other factors. When an advertisement states a preference for a specific religion, such as "Catholics preferred," it is clearly discriminatory. This type of language suggests that individuals of other religious beliefs may be excluded from consideration for housing, which is against the principles of fair housing.

The Federal Fair Housing Act was established to prevent discrimination in housing based on race, color, national origin, sex, disability, and familial status, including religion. Therefore, targeting an advertisement to solicit only one religious group directly contradicts these protections and reflects a discriminatory practice that is not permissible under the law.

In contrast, the other options may have varying implications, but they do not represent religious discrimination in the same clear and prohibited manner. While preferences regarding family structures or pets might not be advisable or inclusive, they are not explicitly covered by the same protections against discrimination as religion is.