Which pair of words in this excerpt from Emily Dickinson's "I Felt a Funeral in My Brain" exhibit slant rhyme?

I felt a Funeral, in my Brain,
And Mourners to and FRO
Kept treading – treading – till it seemed
That Sense was breaking THROUGH–

And when they all were seated,
A Service, like a DRUM –
Kept beating – beating – till I thought
My mind was going NUMB –

And then I heard them lift a Box
And creak across my SOUL
With those same Boots of Lead, again,
Then Space – began to TOLL,

The words with the big letters are the choices