Which of the following is an example of a signal word that indicates contrast?

The identification of "However" as a contrast signal word is accurate because it explicitly indicates that there is a change in direction or an opposing viewpoint compared to what has been previously stated. In writing, contrast signals help to clarify relationships among ideas, highlighting differences or exceptions. For instance, a sentence beginning with "However" sets up a juxtaposition where the reader should expect a statement that contradicts or qualifies the preceding thought. This makes it clear that the subsequent information will differ from or challenge the prior notion.

In contrast, the other choices such as "Moreover," "Additionally," and "Furthermore" serve to add information or examples rather than signal a contrast. These words are typically used to suggest continuation or accumulation of similar ideas, thereby creating a cumulative effect rather than highlighting opposing ideas. Understanding the function of these signal words is crucial for effective writing and comprehension, especially in a professional context like the Occupational English Test.