It might have been a bad idea because they weren't yet fully tested, so no one was sure if they were safe or reliable. It's like how today, many people are reluctant to buy virtual reality machines: because it a new technology that hasn't been dully developed yet.<span />
The answer:
The answer is B.
Answer:
gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern
