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"Surround" and "surrounds" are both correct. It depends on whether you want "that" to refer to "patchwork" or to "fields". Both interpretations make sense.
The patchwork of green fields that surrounds...
Here it's the patchword that surrounds.
The patchwork of green fields that surround...
Here it's the fields that surround.
What's the difference? None.
The problem with A is the ambiguous reference of "them". Does the pronoun refer to "fields" or to "workers"?
In choice B there is no ambiguity. "Whom" can refer only to people, and so here the pronoun refers unambiguously to "workers".
The best response is B.
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