Which one of the following is another name of RDX?

The correct answer is D because Cyclonite is the most common technical name used for RDX in the United States. RDX stands for Research Department Explosive or Royal Demolition Explosive. Chemically, it is a white crystalline solid known as cyclotrimethylenetrinitramine. Different countries use different names for this compound; while it is called Cyclonite in the United States, it is known as Hexogen in Germany and T4 in Italy. The other options provided, such as Cyanohydrin, Selenium, and Cyclohexane, are distinct chemical substances with entirely different properties and uses.