AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(a) Both A and R are true, and R is the correct explanation of A.
Air transport is critical for the north-east due to big rivers, dissected relief, dense forests, frequent floods and international frontiers, which make surface transport extremely difficult.
Source: Airways, Chapter 7
The textbook explicitly states that the north-eastern region is marked with big rivers, dissected relief, dense forests, frequent floods and international frontiers, making air travel essential for access. R directly explains why A is true, so option (a) is correct. Students must check both the truth of each statement AND the logical link between them.