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

Please bring me a glass of water.

Let a glass of water be brought to me, please.

The correct passive voice of the given sentence is Let a glass of water be brought to me, please.

The active voice of the sentence is Please bring me a glass of water. This sentence is in the imperative mood, which is used to give commands or make requests. 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 "I" and the main verb is "bring." The past participle of "bring" is "brought." So, the passive form of the sentence is Let a glass of water be brought to me, please.

The other options are incorrect because:

• Let a glass of water being brought to me, please. is grammatically incorrect. The verb "being" should not be used with the past participle of the verb "bring."
• Let a glass of water come to me. is in the active voice, while the question is asking for the passive voice.
• Let a glass of water be given to me. is also in the active voice, while the question is asking for the passive voice.