Questão número 635574

So in "But things went so smoothly that some security experts...." (l.5-6) has the same function as the underlined word in:

• A. So hot a day was an exception;
• B. She decided to go, so he decided to go, too;
• C. He was reading; as he was doing so, the phone rang;
• D. He hopes to arrive on time; so does she;
• E. He was so embarrassed, he couldn't say a word.