Select the most appropriate set of words from the given choices to fill in the blanks.

___ about prolonged power cuts in urban areas, the authorities have decided to ___ over to more reliable and eco-friendly systems to run its pumps.

A. Worried, shift

B. Frantic, move

C. Troubled, jump

D. Concerned, switch

Please do not use chat terms. Example: avoid using "grt" instead of "great".