The correct option is B persistent
The poet wishes for her friend that he/she has the spirit of a bamboo.
As these lines mention: "Bend with the wind and thus survive, though storms may flatten you... though knives of hate may cut away your hopes of dreams come true,... and grow your dreams anew.", the spirit of a bamboo is persistent. This is because it never gives up. In spite of the wind, the storms and the knives that try to destroy the bamboo, it keeps fighting back and tries to survive.
Hence option A is correct.
Options B, C and D are incorrect because these qualities do not describe its spirit.