The distance measured by a degree of longitude
increases as you move from the equator toward the poles

is constant

decreases as you move from the equator toward the poles

is always about 111 km

Option C. decreases as you move from the equator toward the poles.

Explanation:

The distance measured by a degree of longitude decreases as you move from the equator towards the poles. The degree of longitude is the highest at the equator of the earth that is 111 kilometers and when you goes towards the poles it decreases and the degree of longitude is zero at the poles.

i think that d. wind is the answer.   i missed the question when i answered a. currents.