<h3>Hello there!</h3>
Your question asks what items are amenable to detection by a soft x ray.
<h3>Answer: Genuine coins from counterfeit coins</h3>
The reason why answer choice "Genuine coins from counterfeit coins" would be the correct answer because soft x rays are the ones that detect whether or not a coin that has been put in a machine is real or counterfeit.
Soft x rays to check if people put in coins that are either real or counterfeit. The reason why they check this is because people will try to put counterfeit coins in the machine and try to get something for free, but the x-ray makes sure that doesn't happen.
If a person puts a real coin in a vending machine, the vending machine will detect that the coin is legit and allow the coin to process as positive currency. If someone puts in a counterfeit coin in a vending machine, the vending machine will detect the counterfeit coin and sending right back out, without counting it and positive currency.
<h3>I hope this helps!</h3><h3>Best regards,</h3><h3>MasterInvestor</h3>