Final answer:
The best supporting detail for ongoing animal testing in space is an interview with an official confirming its recent use.
Step-by-step explanation:
The detail from the text that best supports the inference that space programs probably still use animals as test subjects on space flights is (b) An interview with a space program official confirming the use of animals in recent missions. This answer is the most directly related to the current use of animals in space research and provides confirmation from an authoritative source. In contrast, the other options either pertain to past practices, theoretical scenarios, or alternative testing methods that don't necessarily imply current use in space programs.