The correct answer is:

B. There is sufficient evidence to support the claim that the mean weight of African elephants is greater than 2000 kg.

When the null hypothesis is rejected, it means there is enough evidence to support the alternative hypothesis, which in this case is that the mean weight of African elephants is greater than 2000 kg.

Would you like further details on hypothesis testing or have any questions?

Here are five related questions you might find useful:

1. What are Type I and Type II errors in hypothesis testing?
2. How do you set up null and alternative hypotheses in hypothesis testing?
3. What is the significance level, and how does it affect hypothesis testing?
4. How do you interpret p-values in hypothesis tests?
5. What are some examples of real-world applications of hypothesis testing?

Tip: Always double-check the context of the hypothesis test to ensure you're correctly interpreting "rejecting" or "failing to reject" the null hypothesis.