Which lines from "The Inchcape Rock" best support the inference that the bell the Abbot put on the rock saves lives?

"On a buoy in the storm it floated and swung,
And over the waves its warning rung."

"So little they rose, so little they fell,
They did not move the Inchcape Bell."

"When the rock was hid by the surges’ swell,
The mariners heard the warning bell;"

"The buoy of the Inchcape Bell was seen,
A darker spot on the ocean green;"