A. It gives readers a sense of grasping for something that can't be caught.
Answer: This is confusing but I do not agree that much because,
If we simply add the highest number twice from the digits 1-9, 9+9, which is 18. So 18 is the highest number which can be reached so 20 is not a possible number. However, if the problem has said that, we can obtain all the numbers from eleven to twenty by multiplying them, then I think it is possible...
However, instead, and therefore are examples of (advanced) transition words
The bus driver, who only works on weekdays, always waits for me when I'm running late
Comma after the driver
