The theme of 'your world'can be best inferred from which line?
a. to travel this immensity
b. but i was cited the distant horizon
c. your world is as big as you make it
d. and i throb with a burning desire

The best and most correct answer among the choices provided by the question is the first choice "To travel this immensity"

Everyone has his or her own little world, and each of then is unique. The poem “Your World” by Georgia Douglas Johnson indicates the message of how you can expand your world by achieving goals and not giving up. She uses symbols to represent the message in the poem and create stages of how to succeed; this is also why this poem is inspiring. 

I hope my answer has come to your help. God bless and have a nice day ahead!