Best of all, you have an option (6)
I believe the answer is:
choice
This might be a double definition.
'best of all you' is the first definition.
'choice' can be an answer for 'best' (both can mean the most excellent). I am unsure of the 'of all you' bit.
'an option' is the second definition.
(I know that option can be written as choice)
'have' is the link.
Can you help me to learn more?
(Other definitions for choice that I've seen before include "'Option, alternative (6)'" , "Possibility" , "Volition" , "Variety" , "Preference" .)