d.every word in the first sentence of the first page of every chapter.
Step-by-step explanation
the sample space means the set of total possible outcomes or ALL possible outcomes.
so here, thesituation is about the teacher reading a sentence.
the favorable outcome is the set which has all the words that the students would not know from all the words read by the teacher or simply from the sample space.
since the teacher reads the first sentence on the first page in every chapter , all the words in that sentence will be sample in this situation.
