Final answer:
Ducks that usually feed by dabbling or "tip ups" are puddle ducks, which tip forward to feed on aquatic plants and invertebrates in shallow waters without diving. Option B is correct.
Step-by-step explanation:
Ducks that usually feed by dabbling or "tip ups" are Puddle ducks. Dabbling (sometimes referred to as puddle ducks) is a method of feeding that involves ducks tipping forward into the water to graze on aquatic plants and invertebrates. This behavior is typical of ducks that frequent shallow bodies of fresh water, such as ponds and wetlands.
Puddle ducks differ from diving ducks, sea ducks, and mergansers in that they do not typically dive underwater. Instead, puddle ducks stay near the surface and may dip their heads and upper bodies underwater while their tails stick up in the air, a behavior often referred to as a "tip up".