Sometimes the words have different meanings, then their usage also make the sentences meaningless. When a word expresses any emotion at that time it does not have any grammatical relation with the rest of the sentence.
In the first sentence, the meaning is totally changing here well is not showing any emotional feeling despite the usage is giving a different meaning as digging well here implies well dug for water. And the sentence does not contain any interjections.
Hence, the option (A) is incorrect.
In the second sentence, also the sentence is nor showing any feeling or emotions.
Hence, the option (B) is incorrect.
In the fourth sentence, it is about the exam or test regarding which I am hoping that he has done well but no emotion.
Hence, the option (D) is incorrect.
In the third sentence, we can find interjection which is nothing but a feeling or emotion here in the sentence word happy describes about the feeling or emotion.
Therefore, the correct option is .