Context: I gave some to Wakaba earlier . " The scientist explained then began twirling his hair around his finger . " Speechless ? Of course you would be . " He explained still twirling his hair around a slim digit . It was those words that kick started Tatsumi 's brain again .

Question: What may be the reason a few words triggers someone like that ?
Options:
0. None of the above choices .
1. It 's been implanted in their brain .
2. It 's something that happens to someone with scientists .
3. It 's due to past experiences .
Answer: 3