Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 1

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Do private practice doctors and hospital doctors have the same
distribution of working hours? Suppose that a sample of 100 private
practice doctors and 150 hospital doctors are selected at random
and asked about the number of hours a week they work. The results
are shown in the table.
Identify the null hypothesis.
A) Private practice doctors and hospital doctors have the same
distribution of working hours.
B) Private practice doctors and hospital doctors do not have the
same distribution of working hours.
C) Private practice doctors work more hours than hospital
doctors.
D) Private practice doctors work fewer hours than hospital
doctors.