Which sentence is writen in passive voice a stragglers were crossing the finish line an hour later in the back seat the children passed the time by arguing three horses pranced along the fence line a hurricane watch has been issued by the authorities

Passive Voice:

A hurricane watch has been issued by the authorities.

In a passive voice sentence, the subject is being acted upon by the verb issued.

In this sentence the direct object (Hurricane watch) ( has received the action   ( Issued) acted upon by the subject : Authorities .

To identify passive voices, isolate the verb in the sentence and ask who or what is performing the action.  

The passive voice is a grammatical "voice". The noun or noun phrase that would be the object of a corresponding active sentence (such as "Our troops defeated the enemy") appears as the subject of a sentence or clause in the passive voice ("The enemy was defeated by our troops").

So the answer would be:

A hurricane watch has been issued by the authorities.

im the one that plot xxx murder

the answer is c. the wind