Answer: The section: How to stay safe when a volcano threatens; Prepare Now.
Explanation: The webpage ready.gov provides the necessary information that civilians need to know in case of a disaster or emergency. In the area of volcanoes, there is a section named: "How to stay safe when a volcano threatens; Prepare Now.", which presents instructions to follow when a volcano emergency is on course, citing directly from it; "Ask local emergency management for evacuation and shelter plans, and potential means of protection from ash.".
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A restrictive adjective clause is not set off with commas. The correct answer would be the first option. Restrictive clause is a clause that cannot be omitted in the sentence for it will change the idea of the whole sentence. It is the opposite of non-restrictive clause--a clause that serves as an additional information that is set off with commas.