A triangular flow$-$density relationship has the following parameters:

$$ Capacity $($i$.$e$.$ maximum flow$)$: $2000$ veh$/$h

$$ Critical density $($i$.$e$.$ the density at the which the capacity happens$)$: $20$ veh$/$km

$$ Jam density $($i$.$e$.$ the density at which the flow is $0)$: $120$ veh$/$km

During the peak hour, a speed limit of $80$ km$/$h is imposed in an attempt to reduce the traffic congestion. What will be the maximum flow when such speed limit is imposed?

A$)1600$ veh$/$h

B$)1920$ veh$/$h

C$)1800$ veh$/$h

D$)2000$ veh$/$h