• reach men, women and children of all ages who need any kind of athletic shoes
• increase brand awareness
• reach shoppers who are ready to buy right away
• sell high-end running shoes to competitive marathon runners

The correct answer is: sell high-end running shoes to competitive marathon runners

Explanation: With custom affinity audiences, advertisers can create audiences that are more tailored to their brands, compared to our broad, TV-like affinity audiences. For example, rather than reaching Sports Fans, a running shoe company may want to reach Avid Marathon Runners instead.
Read more here: https://support.google.com/google-ads/answer/2497941