Which query helps in retrieving the very first item related to a specified condition?

The query that retrieves the very first item related to a specified condition is FirstWhere. This function is designed to filter a collection based on a condition and return the first element that matches that condition. This is particularly useful when you want to quickly access a specific record without needing to sift through the entire collection or when subsequent processing is based only on the first match found.

Using FirstWhere streamlines data retrieval processes in situations where the order of collection matters, and you only need one result matching the given criteria. It enables efficient querying while minimizing processing overhead, especially in scenarios involving larger data sets.

In contrast, the other choices serve different purposes. CountWhere would return the number of items that meet a condition rather than the actual item, HasMatch checks for the existence of at least one matching item without returning it, and Where produces a collection of all items that meet the criteria rather than focusing on the first one. Therefore, FirstWhere is the most appropriate option for retrieving just the first matching item.