Which of the following functions in Excel is used to combine data from multiple columns into one?

The CONCATENATE function in Excel is used to combine (or join) values from multiple columns or cells into one. This function is particularly useful when you want to merge names, addresses, or other data spread across multiple columns into a single cell. For example, you can combine a first name in one column with a last name in another column into a full name in one cell. Option A is incorrect because VLOOKUP is used to search for a value in a table and return a related value from another column, not to combine data. Option C is incorrect because SUMIF is used to sum values that meet a specific condition, not to concatenate data. Option D is incorrect as a pivot table is used for summarizing data, not for combining data from different columns. Option E is incorrect because LEFT is a text function used to extract a specified number of characters from the left side of a string, not to combine columns.