Ihave many beliefs about how the traffic light system could perform better.
which revision would make this sentence more precise?

a. i believe small changes to the timing would improve the traffic light system.

b. i have some changes that i believe would make the traffic light system work better.

c. if the traffic light system can be addressed, i have some ideas that would make it better.

d. the traffic light system would perform better if my beliefs were heard.