A passage is given below with five blanks labelled (A)-(E). Below the passage, five options are given for each blank. Choose the word that fits each blank most appropriately in the context of the passage, and mark the corresponding answer.

In India, Bhimbetka caves surrounded by the northern boundaries of Vindhya mountain ranges near Bhopal have more than 600 caves that have the oldest prehistoric paintings in India. And out of the 24 world heritage sites, Bhimbetka caves have been ___(A)___ by UNESCO in India, as one of the oldest. These caves had been used as a shelter by people from the earliest periods. Thus, you find paintings of all periods starting from the Paleolithic era to the medieval era. The paintings ___(B)___ to be a mirror showing the evolution of humanity through time. These are very old accomplished ___(C)___ of animals resting or in action. The ___(D)___ shows their draughtsmanship, sense of observation, memory and drawing skills which ___(E)___ the limitations of inadequate materials. These were drawn on rough walls of cave rocks. The meaning of some of them remains undiscovered.