The purpose of a receiving antenna is to:

The purpose of a receiving antenna is primarily to operate as a signal source for the receiver. When radio waves propagate through the environment, they carry information that is picked up by the receiving antenna. The antenna captures these electromagnetic waves and converts them into electrical signals that can be processed by the receiver.

This conversion process is essential because the receiver's role is to extract the information carried by the radio waves; without the antenna acting as a signal source, the receiver would have no signals to process. Therefore, the receiving antenna functions as the critical interface between the airwaves and the electronic systems of the receiver, ensuring that the transmitted information can be accurately received and decoded.

The other choices do not accurately reflect the primary function of a receiving antenna. Amplification, while important in some contexts, does not occur at the antenna level; amplifiers, if used, are separate components in the receiver system. The statement about converting power to signals mischaracterizes the antenna's role, as the antenna primarily captures and transforms radio waves into electrical currents rather than converting power per se. Lastly, transmitting information is wholly the purpose of a transmitting antenna, not a receiving one, as the latter's role is to receive and process those signals.