题目内容
（请给出正确答案）
[主观题]
Which sentence below best expresses the essential information in the highlighted sentence
in paragraph 6？ Incorrect choices change the meaning in important ways or leave out essential information.
A．Most of the houses in the nineteenth century were log cabins or clapboard cottages with simple roofs.
B．There were four or five main house styles in the early nineteenth century, and all were built of wood.
C．In the nineteenth century, wood construction was popular because wood could be used in a number of ways.
D．Wood was the primary construction material of the vast majority of houses built in the early nineteenth century.
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