Select the option that expresses the given sentence in passive voice.

You could put your money to good use.

Your money could be put to good use.

The correct passive voice form of the given sentence "You could put your money to good use" is Your money could be put to good use.

The active voice of the sentence is "You could put your money to good use." This sentence is in the present conditional tense, which is used to describe an action that could happen in the present but is not certain. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "you" and the main verb is "put." The past participle of "put" is "put." So, the passive form of the sentence is "Your money could be put to good use."

The other options are incorrect because:

• Your money is being put to good use. This sentence is in the present progressive tense, which is used to describe an action that is happening now but is not finished. However, the action of putting your money to good use is not happening now.
• Your money could have been put to good use. This sentence is in the past perfect conditional tense, which is used to describe an action that could have happened in the past but did not.
• Your money has been put to good use. This sentence is in the present perfect tense, which is used to describe an action that has happened in the past and is still relevant to the present. However, the sentence does not imply that the action of putting your money to good use is still happening.