Got confused with option B.
I thought that improved is acting as a verb in past tense form but it is not a verb here but an adjective.
All others don't maintain parallelism.
For option D, it is noun phrase || noun phrase || noun phrase
but the third phrase => farming techniques that are improved -- This is awkward and not precise. The phrase improved farming techniques is clean.
Thoughts?
I thought that improved is acting as a verb in past tense form but it is not a verb here but an adjective.
All others don't maintain parallelism.
For option D, it is noun phrase || noun phrase || noun phrase
but the third phrase => farming techniques that are improved -- This is awkward and not precise. The phrase improved farming techniques is clean.
Thoughts?
