To assess the reliability of the three sentences, we can consider the context and if they can be supported by historical evidence or accounts.
A. The first pioneers to explore the opal fields found an unpleasant and unfriendly environment. - This sentence seems to be reliable as it describes a general sentiment often found in historical accounts of pioneers who faced harsh conditions in unexplored territories.
B. None of the pioneers liked summer because it was dreadfully hot. - This sentence is less reliable because it makes a sweeping generalization ("None of the pioneers liked summer"). While many pioneers may have disliked the heat, stating that "none" felt this way is likely inaccurate and subjective.
C. To adapt to the challenging environment, pioneers built underground homes. - This sentence is likely reliable, as historical evidence supports that some pioneers in harsh environments (like opal fields) built underground shelters to cope with extreme temperatures and conditions.
In summary:
- A: Reliable
- B: Unreliable
- C: Reliable