Context: There was a book tucked in there , but she was n't sure she could afford not to keep an eye on Roy right now . With a sigh , he flopped down on the seat beside her . Riza snuck a glance at his face . He looked defeated and worn out."Hawkeye ? " " Yes , sir ? " " Come here a moment . " He tugged her into his lap , wrapping his arms around her waist and burying his face in her shoulder . Riza gently stroked his hair . " Promise me you 'll be careful . " His voice was muffled by her shirt .

Question: Why did she want him to be careful ?
Options:
0. None of the above choices .
1. She could not afford not to keep and eye on him due to the book .
2. She was afraid that someone would give the book to Roy .
3. He was going to do something dangerous and could get hurt .
Answer: 3