PLEASE HELPPP Which scenario would most likely result in genetic drift?

A gardener plants only the seeds from last year's largest vegetables.
A hurricane cuts off a small section of beach from the mainland, dividing a population of sand fleas.
Individual bacteria not killed by a given antibiotic produce offspring that are also unaffected by the same.
Noise pollution prevents female frogs from hearing males with higher-pitched voices, but not males with lower-pitched voices.