Sentence Correction

1. In what promises to be an alternative to corneal transplantation in treating blindness caused from damage to cornea, scientists from city-based L.V. Prasad Eye Institute (LVPEI) in collaboration with U.S. scientists claimed to have discovered potent stem cells in the eye that possess the ability to restore lost sight.
A. In what promises to be an alternative to corneal transplantation in treating blindness caused from damage to cornea, scientists from city-based L.V. Prasad Eye Institute (LVPEI) in collaboration with U.S. scientists claimed to have discovered potent stem cells in the eye that possess the ability to restore lost sight.
B. In what promises to be an alternative to corneal transplantation for treating blindness caused from damage to cornea, the discovery of potent stem cells in the eye by scientists from city-based L.V. Prasad Eye Institute (LVPEI) in collaboration with U.S. scientists possess the ability to restore lost sight.
C. In what promises to be an alternative to corneal transplantation for treating blindness caused from damage to cornea, the discovery of potent stem cells possessing the ability to restore lost sight in the eye by city-based L.V. Prasad Eye Institute (LVPEI)'s scientists along with U.S. scientists, offer hope.
D. Scientists from city-based L.V. Prasad Eye Institute (LVPEI) in collaboration with U.S. scientists claimed to have discovered potent stem cells in the eye, which possess the ability to restore lost sight, and promising to be an alternative to corneal transplantation in treating blindness caused from damage to cornea.
E. Scientists from city-based L.V. Prasad Eye Institute (LVPEI) in collaboration with U.S. scientists claimed to have discovered potent stem cells in the eye that possess the ability to restore lost sight promising to be an alternative to corneal transplantation in treating blindness caused from damage to cornea.

I think it should be A

Can anyone help with this question?