In which situation are toddlers and preschoolers least likely to laugh?

Toddlers and preschoolers are generally expressive and playful, which often leads to laughter during engaging and joyful interactions. They tend to laugh and enjoy themselves in situations that are positive, such as during playtime, when sharing toys, or when being tickled, as these scenarios typically evoke joy and playfulness.

In contrast, laughter is least likely to occur in situations perceived as inappropriate. This could include scenarios that result in discomfort or confusion, which can be more serious than humorous for young children. Children are still developing their understanding of social cues and appropriate behavior, and events that are inappropriate often elicit more concern or disapproval than laughter. Thus, option B is correct as it represents a context where the likelihood of laughter diminishes significantly compared to the other options.