Final answer:
The lowest common denominator (LCD) of 8/51 and 19/85 is 255.
Step-by-step explanation:
The lowest common denominator (LCD) is the smallest multiple that two or more fractions share. To find the LCD of 8/51 and 19/85, we can factor the denominators and identify the common and unique factors. The factors of 51 are 3 and 17, while the factors of 85 are 5 and 17. The common factor is 17. The LCD is the product of all the factors, which is 3 * 5 * 17 = 255. Therefore, the correct answer is c) LCD = 255.