Apart from Rule to make active voice of Present Perfect Tense, which is
Passive subject + has/have + been + third form of verb + by + passive object
Please also note that words like, "someone", "somebody", "people", "police", "public" etc are dropped. But in rare cases we can use them if sentence meaning is not clear.
5. Let us play.
It is suggested that we could play.
It is suggested that we should play.
It is suggested to play.
No change
Answer: Option B
Explanation:
When we use "us" after "Let", it means it is a suggestion. So it is converted as this example.