Which expression does this representation best represent? (See attached file!)

A. 1 3/4 x 1/2
B. 2 x 1 3/4
C. 1 3/4 divided by 1/2
D. 2 divided by 1 3/4

Thank you and please explain your answer!

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220