Which sentence contains a dangling modifier? a. designed by john roebling, the brooklyn bridge spans 1,595 feet across the east river. b. born in germany, america became john augustus roebling's home in 1831 c. built by john augustus roebling, america's oldest existing supension aqueduct is in laxawaxen, pennsylvania. d. a pioneer in the building of supension bridges, john augustus roebling was the first to use steel cables.