Final answer:
A student who cannot delay a planned response lacks 'c. Inhibition'. This refers to the control over impulses and behaviors, differing from language or auditory processing abilities.
Step-by-step explanation:
A student without the ability to withhold or delay a planned response lacks c. Inhibition. Inhibition in this context refers to the cognitive process that allows an individual to inhibit or control their impulses, thoughts, and behaviors.
This mental function is important for self-regulation and executive control, which are fundamental in controlling responses and actions in a variety of situations.
Issues with inhibition may be apparent in scenarios where a person is unable to resist the urge to say or do something immediately, often without considering the consequences or the appropriateness of the action in a given context.
This is different from disabilities in language skills such as Expressive language skills or Pragmatic language skills, which pertain to the ability to effectively express and use language in social situations, respectively.
Likewise, it's distinct from Auditory processing skills, which relate to the ability to interpret and make sense of sounds.