The answer among the given choices is "looks at his mother’s facial expression before touching an unfamiliar toy".
The meaning of Social referencing psychology is the procedure by which babies take prompts from emotive presentations of adults to shape their reactions to specific occasions or their condition and modify their conduct towards other individuals and articles. The emotional or emotive show of grown-ups can be through outward appearances, vocal sounds or non-verbal communication. Social referencing is an imperative apparatus that encourages newborn children to get a feeling of their new condition and the general population and articles that shape a piece of it.