I don't really see a question here, but (a) does not make sense. (b) is fine
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Vincent Teo
(a) The parade teams are verysmartly. "Smartly" is an adverb and cannot be used after the verb 'be' this way.
(b) The teams were dressed smartly. OK
Vincent Teo(A) The teams dressed smartly. OK
(b)TheyThere were many teams parading in the stadium./ There were many teams on parade in the stadium.
YankeeAmy is right but you could say: The parade teams are very smart.
(a) The parade teams are verysmartly. "Smartly" is an adverb and cannot be used after the verb 'be' this way.