Answer:
Option B, Darwin concluded that if traits in captive pigeons could be selectively passed on to offspring, the selection of traits could also happen in nature.
Step-by-step explanation:
Darwin from the study on pigeon concluded that if certain traits with in the pigeons could be transferred/passed on from one generation to another through artificial or selective crossing then the same thing can be achieved through natural selection but the time required for getting the desired results through natural selection would be high.
In other way if artificial selection causes the passing of certain trait in a given population in an instant time period then the same traits can be passed on through natural selection process over a long time period.
Hence, option B is correct.