What is the correct way to rewrite this sentence to remove the comma splice?

My alarm failed to wake me up this morning, I arrived at work late.

Question

What is the correct way to rewrite this sentence to remove the comma splice? 
 
My alarm failed to wake me up this morning, I arrived at work late.

anonymous · Answer

My alarm failed to wake me up this morning I arrived at work late.

My alarm failed to wake me up this morning. Since I arrived at work late.

My alarm failed to wake me up this morning, so I arrived at work late.

My alarm failed to wake me up this morning; for this reason arrived at work late.

anonymous · Answer

I'd say C.

anonymous · Answer

i would agree c is the favorable option, but dont just give away answers @Oscarmenot

anonymous · Answer

thank yall

anonymous · Answer

Sorry, I just didn't know how to do the "Which do you think works best" thing