The correct statement is an example of an externality is a situation where a bank opens a new office, and that new office causes deposits in the bank's other offices to decline. Thus 2nd option is correct.
Externality refers to the outcome of the situation which is affected by the Industrial and commercial activity of the organizations which is not reflected in the market price.
The proper answer is an illustration of an externality is when a bank establishes a new location and the new location results in lower deposits in the bank's other locations.
Therefore, the second choice is the best one.
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