Final answer:
The flower commonly known as "baby's breath" is part of the carnation family (Caryophyllaceae), not the orchid, tulip, or daffodil families. The related families are orchids (monocots with flower parts in threes) and grasses (economically significant monocots), while the aster/sunflower family is known for clustered flowers.
Step-by-step explanation:
The flower commonly known as "baby's breath" belongs to the carnation family, scientifically known as Caryophyllaceae. This family is distinct from others like orchids, which are in the monocot group and exhibit unique floral characteristics such as parts typically in threes, and the grass family, another monocot group that includes economically important crops. The Caryophyllaceae family also differs from the aster/sunflower family (Asteraceae), which is known for dense flower clusters that resemble a single flower. Thus, the correct answer to the question is D. Carnations.