"then" or "and"?
"remove those senses from the equation, …(??)… electronic devices can become our eyes and ears and even our arms and legs."
??) 1) and 2) then

The correct answer is "and".
But in my view "then" also can be the correct one. so, both of them are correct.
Why the answer says that "then" is incorrect??!

Question

"then" or "and"?
"remove those senses from the equation, …(??)… electronic devices can become our eyes and ears and even our arms and legs."
??) 1) and   2) then

The correct answer is "and".
But in my view "then" also can be the correct one. so, both of them are correct.
Why the answer says that "then" is incorrect??!

Answer

Grammatically speaking, "then" would be better because using "and" would be redundant since there is already another "and" right after.