Which word in Group B can be added to Group A? Why?
Group A: complex, on, rat, stall
Group B: accord, gallop, new, tandem
Each word in Group A can be suffixed with the word "ion" to make a new unrelated word.
complex - complexion
on - onion
rat - ration
stall - stallion
accord - accordion
Today's brain teaser courtesy of Braingle.com.