When can exhibitor expect to get an answer

A．that large charcoal sketch by Picasso is not appealing to the eyes
B．that charcoal sketch is Picasso’s first Cubist work
C．it had previously passed through the hands of one of the greatest 20th-century dealers
D．paintings long out of the sight of the public tend to be forgotten

A．its unique mathematical recipe
B．the popularity of its brand among users
C．that it was the first search engine in the world
D．its stock market flotation