How should an analyst concatenate fields "City_Name" and "Region" with a comma and space?

The correct approach to concatenate the "City_Name" and "Region" fields with a comma and space involves using the appropriate string concatenation operator in the context of the expression. In ArcGIS, the exclamation marks indicate field names within an expression, and the plus sign is used for concatenation.

When you choose to concatenate with a comma and space, it becomes essential to include those specific characters in the string. The expression provided as the correct answer accurately incorporates both the comma and the space, formatted as follows: !City_Name! + "," + !Region!. This ensures that there will be a clear separation between the two pieces of information when they are combined, resulting in an output that distinctly displays the city name followed by a comma, a space, and then the region.

The other options fail to format the concatenation properly for the desired output. For example, one of the options does not include the comma and space at all, leading to a direct concatenation without necessary punctuation. Another option uses an underscore instead of the intended space. Thus, the selected option provides the only correct method to achieve the specified formatting.