Which of the following is an example of a linking word?

A linking word, often referred to as a transitional word or phrase, serves to connect ideas, sentences, or paragraphs, guiding the reader through the content and illustrating the relationship between different parts of the text. In this context, the correct choice is a word that demonstrates this function effectively.

"However" is an example of a linking word as it signals a contrast or exception to a preceding statement. It is used to indicate that although one idea might seem valid, there is another that qualifies or contradicts it. This makes it clear to the reader that they should consider this new context or perspective.

The other options, including "Quickly," "About," and "Surprisingly," do not serve the same linking purpose. "Quickly" is an adverb of manner that describes how something is done rather than linking ideas. "About" typically functions to indicate a subject or topic rather than linking thoughts together. "Surprisingly," while it does provide some connection regarding an unexpected outcome, does not fit as universally into the category of linking words as "However" does, which serves a clear logical function in discourse. Therefore, "However" stands out as the appropriate example of a linking word in this context.