What caused southern Sudan to rebel against northern Sudan? desire to control oil reserves

dislike of the nation’s federal system of government

fear that northern Sudan would establish an Arabic and Islamic state

need for foreign aid that northern Sudan refused to accept

its actually B forgive me for my mess up there

Explanation:

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.