Read the following sentences: Sentence 1: Many scientists believe that renewable energy sources are crucial for a sustainable future. Sentence 2: However, transitioning to these sources requires significant infrastructure investments and technological advancements. What is the relationship between Sentence 1 and Sentence 2?
✓ Correct Answer: Option B
Sentence 1 states the belief in renewable energy, while Sentence 2, introduced by 'However,' highlights the difficulties in achieving this, thus presenting a contrasting challenge.