In the adventure of the engineer's thumb the author makes use of a typical element found in his other mystery stories when he describes

In "The Adventure of the Engineer's Thumb," the author makes use of a typical element found in his other mystery stories when he describes

A. Watson taking on a mysterious medical case, early in the morning.

B. Stark luring a victim to a dark, rambling, country house.

C. Hatherley conveniently waking up near the train station.

D. Holmes deducing a connection to a missing-person ad.

D. the answer