Which of the following sentences is grammatically correct?
A. The handle was lose and could of fallen off at any moment..
B. The handle was loose and could of fallen off at any moment.
C. The handle was lose and could have fallen off at any moment.
D. The handle was loose and could have fallen off at any moment.
Choice A: "lose" is incorrect; it should be "loose," which means not firmly or tightly fixed in place. Additionally, "could of" is incorrect; it should be "could have."
Choice B: "could of" is incorrect; it should be "could have."
Choice C: "lose" is incorrect; it should be "loose," and "could of" is incorrect; it should be "could have."
Choice D: This sentence is grammatically correct. "loose" is the correct spelling, and "could have" is the proper form when expressing possibility.
Therefore, the Correct Answer is D.