HW help!!! for physio ex 9.0 exercise 3 activity 6

Part A
When the stimulus intensity increases, _______.

    the number of action potentials decreases
    the size of the action potential decreases
    the number of action potentials increases
    the size of the action potential increases

Part B
In this activity, which of the following will increase the stimulus intensity?

    increasing the duration of the stimulus
    increasing the absolute refractory period
    decreasing the absolute refractory period
    increasing the relative refractory period
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Part C
At threshold, axons will _______.

    Usually be at the end of their absolute refractory period.
    Begin to hyperpolarize the membrane potential.
    Likely generate an action potential if refractory periods have elapsed.
    Always generate an action potential.
Part D
Longer stimuli will allow for _______.

    more action potentials to occur
    the relative refractory period to finish
    the absolute refractory period to finish
    more action potentials to occur, the absolute refractory period to finish and the relative refractory period to finish