Can I say,<br/><br/>(a) Luckily, a young man heard <u>Peter's voice / a sound.<br/></u><br/><br/>(b) Luckily, a young man heard him. <br/><br/>(c) Luckily, a young man heard a <u> shout / shouting.</u><br/><br/><u>(d)</u> Luckily, a young man heard John's shout / shouting.