US traffic signals didn’t always contain the familiar three lights (red, yellow, and green). Traffic lights only ______ red and green lights until the three-light traffic signal was developed in 1923.

Which choice completes the text with the most logical and precise word or phrase?
Choose 1 answer:
Choose 1 answer:
(Choice A) avoided
A
avoided
(Choice B) featured
B
featured
(Choice C) appreciated
C
appreciated
(Choice D) disregarded
D
disregarded