We can say that ,
Use structure “auxiliary + past participle”
The above given sentence is given in Passive Voice :-
The money was added up and found to be correct.

Correct Option: A

We can say that ,
Use structure “auxiliary + past participle”
The above given sentence is given in Passive Voice :-
The money was added up and found to be correct.
Thus , required answer will be option A .

Use structure “auxiliary + past participle”
As per the given above sentence is given in Passive Voice.
It is known to us all that there is only one God.

Correct Option: B

Use structure “auxiliary + past participle”
As per the given above sentence is given in Passive Voice.
It is known to us all that there is only one God.
Therefore ,required answer will be option B .

The Auxiliary Verb that should be used with you is were and not was. Again, as the given sentence is an Interrogative sentence, in Passive form also, the sentence will be Interrogative, that is in Verb + Subject form. Keeping these two conditions in mind, if we judge the given options we find option (a) correct.
Use ‘by whom’ in passive voice. and use structure “auxiliary + past participle”)

Correct Option: A

The Auxiliary Verb that should be used with you is were and not was. Again, as the given sentence is an Interrogative sentence, in Passive form also, the sentence will be Interrogative, that is in Verb + Subject form. Keeping these two conditions in mind, if we judge the given options we find option (a) correct.
Use ‘by whom’ in passive voice. and use structure “auxiliary + past participle”)
By whom were you given permission to enter? ( Passive )

We can say that ,
Use structure “subject + auxiliary + past participle + by + object”
The above given sentence is given in Passive Voice :-
A perfect dam has been built by them across the river.

Correct Option: B

We can say that ,
Use structure “subject + auxiliary + past participle + by + object”
The above given sentence is given in Passive Voice :-
A perfect dam has been built by them across the river.
Therefore ,required answer will be option B .

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
The energy of steam was discovered by James Watt.

Correct Option: B

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
The energy of steam was discovered by James Watt.
Hence , required answer will be option B .