The correct way to punctuate the underlined portion of this sentence is "for their crops, the region had been"
Punctuation refers to a set of symbols and marks which are used to clarify meaning in a text by separating strings of words into clauses, phrases and sentences.
Examples of punctuation marks
Therefore the correct answer is option D; correct as it is.
Learn more about punctuation:
https://brainly.com/question/92653
#SPJ1