An example of social referencing is when an infant or toddlerGroup of answer choicescries when picked up by an unfamiliar adult.looks at his mother's facial expression before touching an unfamiliar toy.prefers one parent over the other.screams with anger when he cannot reach a desired toy.

An example of social referencing is when an infant or toddler looks at his mother's facial expression before touching an unfamiliar toy.

Here's the step by step explanation:

1. Social referencing is a term used in psychology to describe the process where infants and toddlers look to their caregivers for cues on how to respond to unfamiliar events, objects, or people.

2. In the given options, the one that best fits this definition is the scenario where the child looks at his mother's facial expression before touching an unfamiliar toy.

3. In this situation, the child is unsure about the unfamiliar toy and looks to his mother for a cue on how to respond. If the mother looks happy or neutral, the child will likely touch the toy. If the mother looks scared or worried, the child will likely avoid the toy.

4. The other options (crying when picked up by an unfamiliar adult, preferring one parent over the other, or screaming with anger when he cannot reach a desired toy) do not fit the definition of social referencing as they do not involve the child looking to a caregiver for cues on how to respond to an unfamiliar situation.