The integumentary system primarily functions to protect the body, regulate temperature, and provide sensory information. Among the options you've provided, none directly represent the primary functions of the integumentary system. However, the closest relevant function could be "absorbs water," as the skin does play a role in preventing water loss and maintaining hydration.
Nonetheless, if you are looking for a distinct function, the integumentary system also contributes to the formation of a barrier against pathogens and helps in thermoregulation. If your question requires selecting one of the provided options, "absorbs water" would be the most fitting.