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I think the answer is A: defining the problem and proposing a solution.
Feeling Tired. ... * You feeling so tired.*
Brittle, Dry Hair. ...
Ridged or Spoon-Shaped Nails. ... * Your nails break when it's so little bit long , and it's thin*
Dental Problems. ...
Diarrhea. ...
Mood and Mental Health Issues. ...
Easy Bruising and Slow Healing. ...
Slow Immune Response.
Answer: Motor neuron effector
If you accidentally touch hot surface, you automatically
pull your hand away from the object and this response is governed by a simple
combination of neurons called reflex arcs. The sensory neurons carriers the
impulse towards the central nervous system (CNS) then the interneuron carries
these impulses within the CNS, while the motor neuron carries impulse away from
CNS. Therefore, motor neuron is the last structure to respond to a reflex.