Question

where are jet streams found?
close to the poles
in the middle latitude
toward the equator
in the upper atmosphere

Explanation:

Jet streams are narrow, fast-flowing air currents that form high above the Earth's surface, in the upper levels of the atmosphere (specifically the troposphere, around 7-16 km high). The other options describe latitude zones, but jet streams are defined by their altitude in the upper atmosphere, and they can occur across different latitudes (polar, subtropical) rather than being limited to one latitude band.

Answer:

in the upper atmosphere