I've been trying to get this question answered for like an hour someone !
in highland regions, climate temperatures tend to drop as get(s) higher.
a.
winds
b.
sea level
c.
elevation
d.
longitude

In highland regions, climate temperatures tend to drop as elevation gets higher. The correct option among all the options that are given in the question is the third option or option "C". As the elevation increases, pressure and dust content also decreases. I hope the answer comes to your help.

C.  elevation

Explanation:

As the name suggests the highland area is a  region of the high land masses and these usually include the uplands and the area of mountainous zones and the plateaus and the hilly areas of the earth landscape. Typically range from the 500 to 600 meters above the mean sea levels, the example is of the Siberian high lands that are vast an open stretch of the high land formed by the extensive geologic patterns of the earth. Another example of the highlands of the island that cover over 40% of the landmass of Iceland and are thus inhabitable zone for humans. In India, Meghalaya is a high land with long and disconnected hills.