Winning the party’s nomination for president signaled the ______ of the senator’s political career; he had reached his ultimate goal.

A．support the claim that an underwater acoustic device is helpful in identifying and tracking the Ganges River dolphin
B．suggest that, because of this blindness, the Ganges River dolphin survives only in rivers and lakes
C．challenge the claim that the species’ decline in numbers is due to fishing net entanglement, human predation, pollution, or construction
D．refute the claim that the Ganges River dolphin can in fact be identified and tracked by underwater acoustic devices
E．lend credibility to the claim that the Ganges River dolphin is a rare species

A．promoting the use of bicycles in urban areas
B．documenting the rise of car ownership in modern China
C．illustrating the importance of bike lanes in promoting bicycle usage
D．describing the various sources of air pollution in modern China
E． describing the importance of bicycles for transportation in urban China