By "his outdoor cousins" the author means ______. A: other experimenters B: the other doves of the same brood C: doves under the natural sky D: other birds in general

By "his outdoor cousins" the author means ______. A: other experimenters B: B ) the other doves of the same brood C: doves under the natural sky D: other birds in general

In the paragraph 3, "his outdoor cousins" means ______. A: other relatives B: the other doves of the same brood (n. 窝) C: doves under the natural sky D: other birds in general