A city is considering an infrastructur project that involves the construction of a new light rail transit $($LRT$)$ line to improve urban mobility and reduce traffic congestion. The LRT line is expected to span $20$ linear kilometers and serve an estimated $50,000$ passengers per day. The following data has been provided for the project:

Costs:

Initial Construction Costs: $$1\mathrm{.}5$ billion

Annual Operating and Maintenance Costs: $$50$ million

Rolling Stock Costs $($trains and carriages$)$: $$200$ million $($one$-$time cost$)$

Interest Rate: $4\%($for discounting future costs and benefits$)$

Benefits:

Travel Time Savings$**$: $15$ minutes per trip on average

Value of Time$**$: $$15$ per hour per passenger

Reduction in Vehicle Operating Costs$**$: $$1$ per trip

Reduction in Accident Costs$**$: $$5$ million annually

Environmental Benefits$**$: $$10$ million annually $($reduction in pollution and greenhouse gases$)$

Additional Information:

$-$The project lifespan is expected to $30$ years.

The light rail is expected to replace $20,000$ car trips daily.

The average car trip length replaced by the LRT is $15$ kilometers.

Please answer the following questions regarding the project:

A$.$ Calculate the total annual benefits of the LRT project.

B$.$ Calculate the Net Present Value $($NPV$)$ of the project over its $30-$year lifespan, including both costs and benefits.

C$.$ Determine the Benefit$-$Cost Ratio $($BCR$)$ for the project.

D$.$ Based on your calculations, provide a recommendation on whether the city should proceed with the construction of the LRT line. Justify your recommendation with the calculated metrics.