Usage note ... As a collective noun, variety, when preceded by a, is often treated as a plural: A variety of inexpensive goods are sold here. When preceded by the, it is usually treated as a singular: The variety of products is small.
(From my "Words I'm Looking Up" series at my main blog, www.ConjugateVisits.blogspot.com.)
Causes June Casagrande Supports
Planned Parenthood, ClimateCrisis.net, the Richard Dawkins Foundation, Pet Orphans of Southern California, KIVA