Answer: The sentence that contains both a cause and an effect is B. “Her brother placed a housework-wanted ad in a local paper, and Katherine was soon hired as a governess with a wealthy family”.
Explanation: Different logical relationships can be established between sentences or within the same sentence. One of them is<u> the cause-effect relationship, which consists in presenting an event and its consequence or effect</u>. In sentence B.,<u> the fact that her brother placed an ad in the newspaper is the cause of Katherine's hiring</u>. In that way, the fact that Katherine was hired as governess is the effect of the idea presented in the first clause.
