Which of the following is known as design capacity ?

" D " is a right answer as explain below:
Basic capacity: The basic capacity is the maximum numbers of passenger cars that can pass a given point on a lane or a roadway during one hour under the most ideal roadway and traffic conditions that can possibly be attained.
Possible capacity: It is the maximum number of vehicles that can pass a given point on a lane or roadway during one hour under the prevailing roadway and traffic conditions.
Practical Capacity: It is the maximum number of vehicles that can pass a given point on a lane or roadway during one hour with creating unreasonable delay under the prevailing roadway and traffic conditions.
Design capacity: it is the practical capacity or a smaller value determined for use in designing the highway to accommodate the design hourly volume.
Theoretical Capacity: It is the number of vehicles passing any point in one hour per lane.

Possible capacity > practical capacity
So, Answer: Possible capacity

Ans c

It's practical capacity

Practical capacity is the right answer

Design capacity is the practical capacity or a smaller value determined used for designing highway to accommodate the design hourly volume.

Desing capacity is taken as practical capacity

Practical capacity is right

Only practical capacity

It's a practical capacity.

design = practical capacity

D is right
Basic/theoretical capacity

Wrong ans