Task: Text Completion
Input (English): Sentence1: My laboratory professor was explaining today's lab. Sentence2: He told us not to pour water followed by an acid. Sentence3: While I was looking at my notes, I barely paid attention. Sentence4: When the experiment began, I poured water before an acid in a tube. 
 (A) My professor was very upset. (B) My professor congratulated me.
Output (English): B