Many experimenters, using many different methods, have continued research on this important constant(常数).

Although he knew little about the large amount of work done in the field, he succeeded_____other more well-informed experimenters failed.

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