confusing.....
They slept soundly, so they slept ____.
A. noisily B. fast. C. deeply D. good

I'm confusing between C and D.....

Thanks thanks!

Question

confusing.....
They slept soundly, so they slept ____.
A. noisily B. fast. C. deeply D. good

I'm confusing between C and D.....

Thanks thanks!

Answer

'deeply' means they had a very deep, good, sleep.  i.e. it wasn't disturbed and they slept well.

D. should be 'well', as we say "I slept well." or "I had a good sleep."  However, normally, we say the first one.