Answer: Option D
Answer: (d)All of them know the results of the assembly elections. (a) The results of the assembly elections are being known to all of them. (Tense has changed) (b) The results of the assembly elections have been known to all of them. (Tense has changed) (c) The results of the assembly elections were known to all of them. (Tense has changed) (d) The results of the assembly elections are known to all of them. (Correct)