Find the common difference of the arithmetic sequence $\frac{17}{8},\frac{7}{4},\frac{11}{8},1,\frac{5}{8},\dots$

A) $\frac{11}{4}$
B) $-\frac{3}{8}$
C) $-\frac{3}{4}$
D) $-\frac{7}{4}$
E) $\frac{11}{8}$

Ten students in a tutor program at Carleton University were randomly selected.Their grade point averages (GPAs) when they entered the program were less than 9.5.The following data were obtained regarding their GPAs on entering the program versus their current GPAs. $$\begin{array}{cc}\text{ Entering GPA (E) }& \text{ Current GPA (C) }\\ 9.5& 9.6\\ 8.8& 9.1\\ 9.3& 9.5\\ 8.6& 8.6\\ 8.5& 9.0\\ 9.0& 9.4\\ 9.1& 9.2\\ 9.4& 9.7\\ 8.9& 9.3\\ 9.1& 9.3\end{array}$$

A) $\hat{C}$ = 0.711 + 0.346E
B) $\hat{C}$ = 0.873 + 0.627E
C) $\hat{C}$ = 2.51 + 0.529E
D) $\hat{C}$ = 1.54 + 0.8566E
E) $\hat{C}$ = 0.0065 + 0.879E