Final answer:
Surveys, interviews, and testimonials are all relevant sources to support an assertion about the effects of advertising related to team and family members, previous donors, and sponsors from the last year. Hence, the correct answer is d) All of the above.
Step-by-step explanation:
To find information to support the assertion about the effects of advertising in the context of team and family members, previous donors, and sponsors from last year, the most appropriate sources would likely include:
- Surveys distributed to previous team and family members about the effect of this advertising
- Interviews and comments from previous donors
- Written testimonials or quotes from sponsors last year
Therefore, the answer would be (d) All of the above, as each of these sources can provide insight into the impact of advertising on various stakeholders associated with the subject of inquiry.