Answer:
A is the answer i believe
Explanation:
Tip: Further is a comparative form of far. It is also a verb.
adverb
Usage: Far has two comparatives, farther and further, and two superlatives, farthest and furthest. Farther and farthest are used mainly in sense far 1 (sense: 1), and are dealt with here. Further and furthest are dealt with in separate entries.