What best indicates the burglar's method in the text?

The choice that indicates the burglar's method most clearly is the use of new shoes. This suggests a deliberate strategy to avoid leaving identifiable tracks or evidence at the crime scene, which is a key element of a burglar's method. New shoes would minimize the risk of leaving behind distinct footprints that could be traced back to the burglar, highlighting a calculated approach to concealing identity while executing the crime. This reflects an understanding of forensic evidence and a preference for maintaining anonymity.

In contrast, being unobserved refers more to the circumstances of the act rather than the method behind how the burglar operates. Working quickly indicates efficiency but does not provide insight into his methodology; many burglars may vary in speed. Targeting well-known areas suggests selection criteria for the crimes but doesn't directly address the techniques or methods employed during the burglary itself. Therefore, the choice regarding new shoes is the best indicator of a specific method used by the burglar.