The correct answer is: A. contrabands.
Soft X-rays are a type of electromagnetic radiation with a wavelength between 10 and 100 nanometers. They are used in a variety of applications, including medical imaging, security screening, and industrial inspection.
Contraband is any item that is prohibited from being imported or exported. It can include drugs, weapons, and other illegal goods. Soft X-rays can be used to detect contraband by penetrating the packaging and revealing the contents.
Lead is a heavy metal that is used in a variety of applications, including construction, batteries, and ammunition. It is also a common component of bullets. Soft X-rays can be used to detect lead by its characteristic X-ray emission spectrum.
Narcotics are drugs that have a high potential for addiction and abuse. They can include opioids, stimulants, and hallucinogens. Soft X-rays cannot be used to detect narcotics directly, but they can be used to detect the packaging materials that are often used to smuggle them.
Genuine coins and counterfeit coins are made from different materials and have different physical properties. Soft X-rays can be used to detect counterfeit coins by their characteristic X-ray emission spectrum.
In conclusion, the items amenable to detection by soft X-rays are contrabands.