The old concert hall was demolished because of fears that the foundation would be affected by the construction of the new metro line in the area. Modern technology for underground metro construction tried to mitigate the impact of pressurized air pockets created by the excavation of large amounts of soil. But even with these safeguards, it was feared that the concert hall would not be stable.
From this, one can infer that:
A. the foundations of old buildings create pressurized air pockets underground, which are difficult to handle during metro construction.
B. metro construction has to be done carefully considering its impact on the foundations of existing buildings.
C. construction in an area from an impossible hurdle to metro construction in that area.
D. pressurized air can be used to excavate large amount of soil from underground areas.
GATE 2017 · General Aptitude · Passage Reading · hard
Answer: B. metro construction has to be done carefully considering its impact on the foundations of existing buildings.
Identify the causal chain in the passage: Metro construction -> excavation of large soil -> pressurized air pockets -> risk to nearby foundations -> concert hall demolished. The direction of causality is clear: metro construction causes risk to foundations.
Test option B against the passage: The passage says technology 'tried to mitigate' the impact and fears remained. This directly implies that metro construction must be done carefully (with safeguards) because it affects existing buildings. Option B captures this perfectly.
Eliminate other options: Option C: construction was not called 'impossible' — the hall was simply demolished as a precaution. Option D: pressurized air is a problem to manage, not a useful excavation method. Both options distort the passage meaning.