First of all, meaning is KEY for this question. The original sentence is wrong because
the posture (a characteristic) CAN'T be compared to the
depiction (a picture). The correct comparison should be between
the posture of the REAL dinosaurs and the posture of the depicted dinosaurs.
Bipedal dinosaurs' standing posture differs from virtually every visual depiction
of them created before the 1970s, when scientists reevaluated their assumptions
about tripod-style balance.
(A) Bipedal dinosaurs' standing posture differs from
Wrong. CAN'T compare the posture of the dinosaur and the picture.
(B) Bipedal dinosaurs stood in a posture that differs from
Wrong. Same error as in A. CAN'T compare the posture of the dinosaur and the picture.
(C) Bipedal dinosaurs exhibited standing postures that differ from those of
Correct. Comparison: postures of the REAL dinosaurs and those (postures) of the depicted dinosaurs.
(D) The standing posture of bipedal dinosaurs differs from
Wrong. Same error as in A and B. CAN'T compare the posture of the dinosaur and the picture.
(E) The characteristics of bipedal dinosaurs' standing posture differ from those of
Wrong. We're comparing the postures of real dinosaur and those of depicted dinosaur. We do NOT compare the characteristics of the posture of the real dinosaur and those of the posture of the depicted dinosaur ==> E changes meaning.
Hope it helps.