Consider the Following to Answer the Question(s) Below

Multiple Choice

Consider the following to answer the question(s) below:
A consumer group was interested in comparing the operating time of cordless toothbrushes manufactured by two different companies. They took a random sample of 18 toothbrushes from Company A and 15 from Company B. Each was charged overnight and the number of hours of use before needing to be recharged was recorded. Company A toothbrushes operated for an average of 119.7 hours with a standard deviation of 1.74 hours; Company B toothbrushes operated for an average of 120.6 hours with a standard deviation of 1.72 hours. Do these samples indicate that Company B toothbrushes operate more hours on average than Company A toothbrushes?
-The correct null and alternative hypotheses (assuming Company A is group 1 and Company B is group 2) are

A) H0 : µ1 - µ2 = 0 and HA : µ1 - µ2 > 0.
B) H0 : µ1 - µ2 > 0 and HA : µ1 - µ2 < 0.
C) H0 : µ1 - µ2 = 0 and HA : µ1 - µ2 < 0.
D) H0 : µ1 - µ2 = 0 and HA : µ1 - µ2 ≠ 0.
E) H0 : µ1 - µ2 < 0 and HA : µ1 - µ2 > 0.