Which of the following choices is located at 0° longitude?
a. equator
b.-prime meridian
c.-south america
d.-north america

Option (b) is the  correct answer of this question.

Explanation:

Prime Meridian is located at 0° longitude.A prime meridian is the meridian (a longitude line) in a system of geographic coordinates in which longitude is defined as 0 ° is known as prime meridian.

Unlike an equator defined by the rotation axis, the primary meridian is arbitrary.Various definitions for the Earth's prime meridian have been used or encouraged in different regions throughout history.

i am a little confused myself with what goes with the letters and what goes with the numbers but ill do my best to you

the cordillera states and grand canyon are along the southwest u.s. and northern mexican pacific.

the great plains and southwest desert are also the prairie and home to many earthquakes too .

the coastal plains have poor soil and many factories started in the south.

is this what u needed? if not i can see what i can do