Question

choose the answer that best completes the sentence below. the new calaveras dam has been engineered to prevent it from breaking during an earthquake. ___, it is being strengthened, in part, by having zones of compacted material, including a thicker core of impermeable clay. a on the other hand b however c for example d in conclusion

Explanation:

We need to choose a transition - phrase that makes logical sense in the context of the sentence about the dam being strengthened. "On the other hand" is used to present an alternative or contrasting idea. "However" is used to introduce a contradiction or contrast. "For example" is used to give an illustration. "In conclusion" is used to sum up. Here, no contrast or conclusion or example is being made in the context of the sentence construction. The sentence just continues to describe the dam's features for strengthening. None of the given options are truly necessary for the sentence's grammar or meaning, but if we have to choose the least - inappropriate one, we consider the flow of the description.

Answer:

No option is clearly correct as the sentence can stand without any of these phrases. But if forced to choose, none of the provided options (A. On the other hand, B. However, C. For example, D. In conclusion) are ideal, but the sentence's context doesn't suggest a contrast, example, or conclusion, so we note the oddity of the question setup.