we study the birds by() A.doing bird count B.counting them 选哪个?为什么?

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we study the birds by() A.doing bird count B.counting them 选哪个?为什么?
we study the birds by() A.doing bird count B.counting them 选哪个?为什么?

we study the birds by() A.doing bird count B.counting them 选哪个?为什么?
应该选B
选A有语法错误,应该是by doing a bird count,count是可数名词,所以不可缺少定冠词a
选B是正确的

by +doing 选B

b ,we study the birds count them