29. Which of the following factors can enhance separation efficiency in chromatographic separations?
 (i) Use of uniform stationary phase particle sizes
(ii) Operation at a flow rate close to the Van Deemter optimum
(iii) Thin stationary-phase film thickness
(iv) Slow diffusion coefficient of analytes in the stationary phase
(v) Use of a narrow internal-diameter column
(vi) Use of small packing particle sizes
(vii) Creation of a large detector cell (detection window)
(viii) Injection of a large sample volume
(A) (i), (ii), (iii), (iv)
(B) (i), (ii), (v), (vi)
(C) (iii), (iv), (vii), (viii)
(D) (ii), (v), (vi), (vii)
(E) (i), (iii), (vi), (viii)