Which feature is a common identifying mark of counterfeit currency?

The presence of watermarks and distinct textures is a key feature in identifying genuine currency and serves as a prominent detection method against counterfeiting. Authentic currency is designed with intricate elements such as watermarks, which are visible when held up to the light, and distinct textures that differentiate them from regular paper. These features are intentionally incorporated into the design of legitimate banknotes to ensure their authenticity, as they are difficult for counterfeiters to reproduce accurately.

Counterfeit currency often lacks these sophisticated elements, making option B the correct choice. This sophistication in design and tactile experience is crucial for anyone handling money—especially law enforcement officials and businesses—who must be able to spot counterfeit notes quickly and effectively.