Antonyms for "delicate" include: sturdy, robust, strong, indestructible .
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Note: These are words that come to mind.
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When you enumerate you need to put comas between all the items except the ones which are connected by "and" : as A is not correct as it does not have comas, and B is incorrect as it has comas where "and" is.
now, in a way both C and D are correct, but C is the usual accepted version, and D is an example of "Oxford coma" (where the coma is optional, to remain on the safe side, choose C).
nonviolent resistance is an important tool in the fight for positive change.
I think
