Which of the following best describes the algebraic expression x/6-1?

a. six divided by a number less than one. b. six divided by a number minus one. c. a number divided by six less than one. d. a number divided by six minus one.

The option which best describes the algebraic expression x/6-1 is the last one - D. A number divided by six minus one.
A and B would mean that 6 is above the line, and x below it, which is not the case. C would mean that under the line it says x - 6, and not the other way round, which is why D is the correct answer.