To evaluate the reliability of the three sentences, consider the following:
A. "The first pioneers to explore the opal fields found an unpleasant and unfriendly environment." - This sentence presents a subjective opinion, which can be seen as unreliable since it doesn't provide specific evidence or sources to back up the claim.
B. "None of the pioneers liked summer because it was dreadfully hot." - This sentence also reflects a subjective opinion and a generalization that may not be accurate for all pioneers, making it unreliable.
C. "To adapt to the challenging environment, pioneers built underground homes." - This sentence presents a factual statement that can be verified, making it reliable.
Based on this evaluation:
- A is unreliable
- B is unreliable
- C is reliable
Thus, the correct response is:
A is unreliable, B is unreliable, C is reliable.