Identify the three sentences are unreliable or reliable a the first pioneers to explore the Opal fields found an unpleasant and unfriendly environment none of the pioneers summer because it was dreadfully hot to adapt the challenging environment, pioneers built underground homes
1. "The first pioneers to explore the Opal fields found an unpleasant and unfriendly environment." - Reliable. This sentence provides information about the pioneers' initial experience in the Opal fields.
2. "None of the pioneers summer because it was dreadfully hot." - Unreliable. The sentence seems to contain a grammatical error and does not make logical sense.
3. "To adapt to the challenging environment, pioneers built underground homes." - Reliable. This sentence explains how the pioneers coped with the difficult conditions by constructing underground homes.