I wish I was as knowledgeable about edible flowers as my aunt.

Which sentence is the BEST revision of this sentence?

A. I wish I have been as knowledgeable about edible flowers as my aunt.

B. I wish I am as knowledgeable about edible flowers as my aunt.

C. I wish I be as knowledgeable about edible flowers as my aunt.

D. I wish I were as knowledgeable about edible flowers as my aunt.