Five fledging sea eagle left their nests in the ..........this summer, bringing to 34 the number of wild birds successfully raised since transplants from Norway began in 1975
OG explanation: Bringing is the present participle of the verb to bring. As used here, it correctly describes an action that happens at the same time as the action in the main clause; bringing indicates that the number of wild birds became 34 when the five eagles left their nests.
B: in this construction, the subject of the second verb nust be the same as the subject of the first verb, but five eagles cannot grammatically or logically be the subject of brings