Hello dear Tutor, can you kindly explain how we get the answer of the below question

Suppose you are holding a long position in euro futures contract that matures in 76 days. The agreed upon price is $1.15 for 125,000 euro. At the close of trading today, the futures price has risen to $1.155. Under marking to market, you now

a) hold a futures contract that has risen in value by $1,250

b) hold a futures contract that has fallen in value by $625

c) will receive $625 and a new futures contract priced at $1.155

d) must pay over $1,250 to the seller of the futures contract