In the Summer of 1990, the galleries of the fine arts museum in Washington were closed due to excessive heat caused by a faulty cooling system,which raised its humidity to such levels so that artificats were beginning to show damage and employees were falling ill due to heat exhaustion.

A)due to excessive heat caused by a faulty cooling system,which raised its humidity to such levels so that artifacts were beginning to show damage

B)due to excessive heat from a faulty cooling system,thereby raising its humidity to levels such that artifacts were beginning to show damage

C)because of a faulty cooling system causing excessive heat, which raised their humidity to such levels that artifacts began to show damage

D)because of excessive heat caused by a faulty cooling system,which raised its humidity to such levels that artifacts were beginning to show damage

E)because of excessive heat caused by a faulty cooling system,which raised their humidity to such levels that artifacts were beginning to show damage