The correct answer is 'has.' Key Points - The given sentence is in the Present Tense and we need to use the Present Perfect Tense in the second half of the sentence. - Structure: Has/have + V3 - Example: I have achieved my goals. - Had is the V3 form of Has/have. - Therefore, out of all the options, the correct answer is 'has.' - The correct sentence: Your attempt can hardly be called successful, for it has had no good results.