Question

read the \who\ section of the \beat the heat\ infographic. what is the authors purpose in this section?
to inform the reader about summer vacation spots
to inform the reader about who is most vulnerable to extreme heat
to inform the reader about hydration and air conditioning

Explanation:

The section is titled "Who", which typically refers to people. Extreme heat vulnerability relates to identifying groups (who) at risk. Summer vacation spots and hydration/AC are not about "who".

Answer:

to inform the reader about who is most vulnerable to extreme heat