How can you specify a page has the highest priority?

You can specify a page has the highest priority by setting the priority tag to ?

1.0

Explanation:

Priority Tag is to be mentioned in Sitemaps

Various priority values range from 0.1 to 1.0. The highest priority page has the priority value = 1.0, and the lowest priority page has a value of 0.0, and the priority value varies with the priority of the page. And these values are assigned to the priority tag in the sitemap. The sitemap, in fact, is the XML file through which we can set the priority of a webpage.  

answer; (b) agriculture, food, and natural resources;