Your answer is A desert most of Australia is a desert climate.
I believe the answer is: <span>convenience sampling
</span><span>convenience sampling refers to the method in collecting data in which the subjects are taken from the group of people that are easily accessible by the researchers.
</span>(since Dr. Rhodes is a professor, his Students could be considered as convenience sampling)
Sarah would be considered as detour taker type of conversational partner. Characteristic for this type for conversational partner is that <span>can't stay on point. Sarah shifts from one theme to another, so she is a detour taker type of partner in a communication. </span>
A or d are the most reasonable answers
