Final answer:
To multiply fractions, multiply the numerators together and the denominators together. Simplify the fraction, if necessary.
Step-by-step explanation:
To multiply fractions, you multiply the numerators together and the denominators together. So, 7/8 times 3/9 is (7 times 3) / (8 times 9), which is 21/72. Since both 21 and 72 can be divided by 3, you can simplify the fraction to 7/24. Therefore, the answer is a) 7/24.