Final answer:
The Cognitive perspective suggests that individuals with schizoid personality disorders have difficulty processing emotional cues, unlike the Behavioral perspective, which focuses on observable behaviors and external environmental influences.
Therefore, option C is correct.
Step-by-step explanation:
The psychological perspective that proposes people with schizoid personality disorders lack emotional cues from others and are therefore unable to respond to emotions is C) Cognitive perspective. This perspective focuses on the way people perceive, process, and retrieve information, and it suggests that individuals with such disorders may have difficulty understanding and processing emotional signals from others, leading to their detached and aloof behavior. It's important to note that this is in contrast to the behavioral perspective, which does not focus on internal thoughts or feelings, but rather on observable behaviors and the external environment as factors shaping personality through learning and conditioning.