Read these lines from the poem:

i am a part of all that i have met;
yet all experience is an arch wherethro'
gleams that untravell'd world, whose margin fades
for ever and for ever when i move.

which of these is an apt explanation of these lines?

each milestone of achievement opens up a new world to be experienced.

achievement of a goal ends the process of garnering experience.

all experience gleams through an arch in our dreams.

a sea voyage makes the horizon seem like a fading margin.