I think it may be C or B I don’t think it’s D or A.
The correct answer is option two.
An infinitive phrase consists of an infinitive verb, and can be followed by a complement or a modifier, which is usually an adverb.
In the sentence above, the infinitive phrase comes before a complement "variety and interest to their writing."
Answer:
1783, The hot air balloon paved the way for other inventors to explore and experience the sky, Montgolfier Brothers
