
Options are:
- Number of Keywords
- Type of product or
service
- Maximum cost-per-click (CPC) bids
- Number of ad groups per campaign
Right Answer:
“Type of product or
service“

Answer Explanation:
An advertiser should group
their campaigns
by type of product or
service. A great rule of thumb for building an effective campaign
structure is to mirror your website’s structure.
By creating campaigns and ad groups around a particular theme or
product, you can generate keyword lists that directly correlate to
the corresponding ad text and ads that link directly to that
product’s page on your website. You can even add
keyword-specific URLs to enhance the quality and significance of
your ads in your account.

Read more here: https://support.google.com/adwords/answer/2375470?hl=en