Answer: Odysseus convinces Penelope that he is Odysseus because c) only he would know the secret about the bed.
Explanation: When Odysseus returns to Ithaca disguised as a beggar, Penelope suspects that he is actually Odysseus but she is not completely sure about it. As a result,<u> Penelope tests his identity by asking Eurycleia to move Penelope and Odysseus' wedding bed taking into account that Odysseus knows the secret about the bed</u>. When Odysseus tells her that moving the bed is impossible because the frame was attached to an olive tree within the room, Penelope is finally convinced that he is Odysseus.