A nurse is assessing a client with congestive heart failure (CHF). Which assessment tool will provide a reliable measure of fluid retention for this client?

The correct answer is B: Daily weight measurement. Daily weight monitoring is a reliable measure of fluid retention in clients with CHF because sudden weight gain can indicate fluid accumulation due to the heart's inability to pump effectively. This method helps track changes in fluid status, guiding treatment adjustments. Cardiac monitoring (A) primarily assesses heart rhythm and function, not fluid retention. Blood pressure monitoring (C) is important but may not directly reflect fluid status. Urine output measurement (D) is useful for assessing kidney function but may not provide a comprehensive picture of fluid retention.