What Would the Following Proposition Be in Standard Form? My

Multiple Choice

What would the following proposition be in standard form? My keys are somewhere in my office.

A) All of my keys are objects in my office.
B) If an object is one of my keys, then it is in my office.
C) No office of mine is a place without my keys.
D) My keys are in my office or I would know where they are.
E) Some place in my office is the place where my keys are.