Final answer:
The concept related to how children raised in social isolation may not develop a self-image is the 'looking-glass self'. This theory, introduced by Charles Horton Cooley, posits that self-image emerges from our perception of how others see us.
Step-by-step explanation:
Children who are reared in social isolation are unlikely to fully develop a self-image, as this typically emerges through social interaction. According to George Herbert Mead, these children may never develop a self-image that reflects how others respond to them because they haven't engaged in social processes necessary for developing the 'self'. The correct answer to the question would be 2) looking-glass self, which is the concept that suggests our self-image develops from how we believe others perceive us. Charles Horton Cooley introduced this idea, and it plays a critical role in our understanding of self-development.
The looking-glass self theory implies that we form our self-identity through our interpretation of other people's views and responses. Without the feedback from social interactions, individuals like children raised in isolation cannot develop this aspect of the self. Hence, they lack a fully-formed self-image because they do not have the experiences of seeing themselves through the eyes of others, which is essential according to the looking-glass self theory.