Which sentence uses correct capitalization?

Ai told jilly and ryan to take a left at main street and then head south for two miles before hitting bolt avenue.

Bi told jilly and ryan to take a left at main street and then head south for two miles before hitting bolt avenue.

Ci told jilly and ryan to take a left at main street and then head south for two miles before hitting bolt avenue.

Di told jilly and ryan to take a left at main street and then head south for two miles before hitting bolt avenue.