能否给一下其他几项的英文定义？
问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
orange品职答疑助手 · 2018年04月29日
A hedge is an investment position intended to offset potential losses or gains that may be incurred by a companion investment. In simple language, a hedge is a risk management technique used to reduce any substantial losses or gains suffered by an individual or an organization.
Speculation is the purchase of an asset (a commodity, goods, or real estate) with the hope that it will become more valuable at a future date. In finance, speculation is also the practice of engaging in risky financial transactions in an attempt to profit from short term fluctuations in the market value of a tradable financial instrument
In economics and finance, arbitrage is the practice of taking advantage of a price difference between two or more markets: striking a combination of matching deals that capitalize upon the imbalance, the profit being the difference between the market prices.