326 (bonus) Answer: (a) Jesus means He is the only way to the Father
Read John 1:51 in context (John 1:48-51) Note: angels ascending and descending immediately brings Jacob's Ladder (Gen 28) to mind for us today and for the Jews of Jesus’ day. In his dream God was at the top of the ladder and revealed Himself to Jacob. Jacob called place “the house of God” and “the gate of heaven" (v. 17), so it is reasonable to conclude that Jesus is calling Himself the gateway to heaven and the Father.
Note: in the People's Bible Commentary: John, page 36, Gary Baumler tells his readers that Jesus is clearly referring “to Jacob’s dream at Bethel when he fled from the anger of Esau (Genesis 28:12), Jesus offered an open heaven as the greater thing he had to give Nathanael and the others. Yes, he was 'the Son of God.' Yes, he was ‘the King of Israel.’ And as such he was the only way to get to heaven. ... ‘I,' Jesus was saying, ‘am the stairway that links heaven and earth.'”
Note: Baumler also explains “the Greek is plural” (p. 36) when Jesus says, “I say to you, you will see heaven opened...” (John 1:51). Accordingly, while Jesus may still have been addressing Nathanael, He was speaking to the larger group that was present at the time.