求问一道语法平行题

maggiesmile521

在群里看到有人发了一道JJ，A the plan of last year was less effective ,I contend, than the new plan I have proposed for the next year.

B the plan of last year was less effective,I contend, than the new plan for the next year,I proposed.
说是A对，求大牛分析，没太看明白，谢谢