此题如何画图求解?

题目如下:

Alan also proposes the following duration-neutral trades for the client:

• Long/short trade on 1-year and 3-year government bonds;
• Short/long trade on 10-year and long-term government bonds.

Q. Which yield curve forecast will most likely result in the highest profit for Alan’s proposed duration-neutral trades?

1. Increase in curvature (correct)
2. Decrease in curvature
3. Parallel downward shift

请问此题如何画图求解? 谢谢.