Which type of thunderstorm forms in a narrow band that's about 10 to 20 miles wide? a. single-cell thunderstorm b. multi-cell line c. multi-cell cluster d. supercell

B. Multi-cell line

Explanation:

A multi-cell line, or how it is more commonly known, a squall line, is basically a group of storms forming a line, like a bow, they have been seen to cover  hundreds of miles long but usually only 10 or 20 miles wide.

It is theorized that this is because when a cyclone is formed, there are two forces of "wind" one ahead and one behind, concentrating air masses as if the winds were "squishing" them to form a line.

the answer is a. at the equator