Answer:
Answer given below.Step-by-step explanation:
The phrases "this challenges" and "this emphasizes" are stronger than the more common phrase "this shows" because they convey a sense of impact and significance.
When the writer says "this challenges", they are indicating that the information being presented poses a difficulty or obstacle to some commonly held belief or assumption. This suggests that the reader should pay attention because the information being presented is not simply confirming what they already know, but is asking them to rethink their understanding of the topic.
Similarly, when the writer says "this emphasizes", they are indicating that the information being presented is particularly important or noteworthy. This suggests that the reader should pay attention because the information being presented is not just any piece of information, but one that stands out as particularly significant or meaningful.
In contrast, the phrase "this shows" is more neutral and simply indicates that the information being presented is demonstrating or illustrating a point. While it may still be useful, it does not carry the same weight as "this challenges" or "this emphasizes" in terms of conveying the significance or impact of the information being presented.