请帮忙回答下英文选择题.

<<Bruce's dad first began introducing him to the rudimentary steps of reading when he was barely four years old. When the vocabulary was over his head, his father would put it in the vernacular so he could grasp the meaning. >>
这句话中,vernacular做何解释?在下列选向选择:
a. pronounced the words distinctly.
b. defined the words.
c. wrote them out.
d. explained them in every-day terms.
请问答案B是否正确?

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