A. Let us thank God for all the good things.
B. God must be thanked for all the good things.
C. God could be thanked for all the good things.
D. God must be thanked by us.
The given sentence contains one of Model verb (Model Verb = will, shall, can, may, might, could, might, must, would). It is in active voice.
Rule :
Subject + Model verb + be + V3 + Optional Objects.
