HELP (20 points)

Which statement demonstrates a known impact of introducing a new species into an ecosystem?

A) When introduced to Australia to devour pest insects, cane toads serve their purpose and do not disrupt the ecosystem.

B) When introduced to the United States, mute swans do not compete with native trumpeter and tundra swans.

C) When released into a pond in the United States, the voracious northern snakehead fish from Asia can quickly kill off all native fish.

D) European starlings, when released in the United States, compete for nesting holes but do not disturb native species.