A) toilsome
Toilsome: characterized by effort to the point of exhaustion; especially physical effort
Visitors should prepare for a trip by bringing clothing for different types of weather
The entire second paragraph discusses how the different oceans/seas surrounding the park causes different weather. There can be dry air, blizzards, etc. which all cause a person to dress differently.
It conveys the subject of the paragraph.
That way, the subject can be further elaborated and backed up with supporting statements/evidence in the following sentences of the paragraph :)
Answer:
STEP 1 – Determine your home government's no-objection procedure.
STEP 2 - Complete the online J visa waiver recommendation application.
STEP 3 – Submit a statement of reason.
STEP 4 – Request that a no-objection statement from your home government be sent to the DOS.
Explanation:
B is my best guess for this question