Answer:
B. List each book on a separate piece of paper, place them all in a hat, and pick three
D. Number the books from 1 to 9 and use a random number table to produce 3 different one digit numbers corresponding to the books selected
Step-by-step explanation:
In Simple random sampling each unit has equal chance of being selected in sample.
In Option A and C selection of book is not random, Also each book has not have equal chance of selection. Thus, they would not produce a simple random sample.
Thus, Only Option B and D are correct.