【单选题】

It would be a shallow kind of optimism to assume that the introduction of the art of inventing has been an immediate and unmixed blessing to mankinD、

A、It would be a shallow kind of optimism to believe that the introduction of the art of inventing has directly benefited only mankinD、
B．It would be a shallow kind of optimism to believe that the introduction of the art of inventing has benefited mankind directly.
C．It would be a shallow kind of optimism to think that the introduction of the art of inventing has blessed mankind immediately and blessed only mankinD、
D．It would be a shadow kind of optimism to believe that the introduction of the art of inventing has benefited mankind immediately and brought them only benefit.