How should you signal to lower the tines?

Signaling to lower the tines is done using a specific hand signal that conveys the intended action clearly to the operator. The correct answer indicates the proper technique for this signal, which involves extending the arm with the palm facing down. This clear position is universally understood in the context of hoisting and rigging, and it communicates the command to lower the tines effectively.

By keeping the arm extended and the palm down, it signifies a descending motion, which is what the operator should follow. This minimizes the risk of miscommunication and ensures that the operator takes the correct action at the appropriate time.

In the other choices, the signals do not convey the same clear intention. For instance, having the forearm vertical with the forefinger pointing up does not suggest lowering but could be interpreted in various ways. Clasping hands in front of the body is ambiguous and does not provide a standard signal for any specific action. Lastly, extending both arms, palms down, might suggest a broader movement but lacks the clarity required for the specific task of lowering the tines. Thus, the choice that specifies extending one arm, with the palm down, is the most effective and universally recognized signal for indicating a lowering action.