The correct passive voice transformation of the sentence "Please send the parcel today" is:
"You are requested to send the parcel today."
Here's why the other options are incorrect:
- You send the parcel today: This is still active voice, just without the "please."
- Today the parcel you send: This sentence is grammatically incorrect and doesn't convey the original meaning accurately.
- The parcel must be send today: This sentence uses "must" instead of a form of "be" to create the passive voice, which is incorrect.
Therefore, the correct option is "You are requested to send the parcel today." This sentence uses the past participle ("requested") with a form of "be" ("are") and places the object ("the parcel") at the beginning of the sentence, effectively changing it to the passive voice.