The given sentence is describing the condition of Eko Bridge, which connects Lagos Island to Surulere:

A. Many traffic: This option is not grammatically correct. "Traffic" is an uncountable noun, so it doesn't take the plural form "many." It should be "much traffic," but this still doesn't sound natural in this context.

B. Numerous vehicles: While this option is grammatically correct, it doesn't capture the essence of the original sentence. The sentence is about traffic on the bridge in general, not just the number of vehicles.

C. Uncontrollable traffic: This option implies that the traffic cannot be controlled, which might not be the intended meaning. It doesn't specifically convey the volume of traffic.

D. Plenty traffic: This option is not grammatically correct. It should be "plenty of traffic." However, even with the correct grammar, it sounds a bit awkward.

E. A lot of traffic: This option is the most natural and appropriate choice. It conveys the intended meaning that there is a significant volume of vehicles and congestion on Eko Bridge, making it a clear and concise way to describe the situation.

Therefore, the best choice to fill in the blank space is "A lot of traffic" because it accurately and naturally conveys the idea of heavy congestion on Eko Bridge.