Final answer:
The best example of functional play is (D) Playing with Legos to build objects, as it involves using motor skills and coordination.
Step-by-step explanation:
The best example of functional play among the given options is (D) Playing with Legos to build objects. Functional play is a type of play where children engage in activities that use muscles and motor skills. It is characterized by simple, repetitive activities that may involve objects and toys. Playing with Legos allows children to manipulate small pieces, construct different structures, and is an excellent example of using motor skills in play to understand the world around them. This kind of play is beneficial in the early stages of a child's development as it helps them to learn and practice fine motor skills and coordination. Other examples might include a child putting a square peg into a square hole on a toy, which similarly demonstrates functional play by using motor skills to achieve a goal.