The correct option is B If you travel
Option A: The words 'you can move' don't form a coherent sentence. Instead, it forms two different sentences, which cannot be separated by a comma ','. Hence option A isn't very suitable.
Option B: 'After leading' forms a sentence incomplete in meaning: "After leading without too much planning..."
Option C: 'Try going to' also does not complete the sentence. 'To' is a preposition and must be followed by a noun or its equivalent. The word that it follows 'going' is a participle (verb form) and the word that comes after 'without' is a preposition itself.
Hence options A, B and C are not very suitable.
Option D: 'If you travel' introduces a hypothetical statement. It completes the meaning of the sentence, presenting a hypothetical situation "if you travel without too much planning" and its probable result: "you can discover new places". It's the most appropriate option.
Hence D is correct.