What is the answer ? a. cell. b. tissue c. organ

What exactly is the question

The image seems to just be a diagram of a leave is it asking what the leave would be considered .

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: