You only have two options (below) because Google chooses for you based on the search term the person used in their search…
The screen shot below was taken from Google.com’s direct answer to this question (https://support.google.com/webmasters/answer/6229325?hl=en). We can make the site not allow Google to choose for you using Option A below but we don’t recommend it because it could dramatically hinder your website’s ranking for certain search terms.
