The correct answer is D, The word following the '-' is to be excluded from the search.
When searching something on any search engine, if we use a hyphen before a keyword, that looks like a minus sign, " - ", it gives results opposite to that keyword. It will exclude all the searches including that keyword. Similarly, if we use a Plus sign, " + ", before a keyword, it will show us the results containing this keyword.
There are many symbols that are used to refine our search. For example, colon, semicolon, quotation marks, two periods, asterisk, etc are used to refine our search.