Select the correct text in the passage.
Which detail shows that Jack and Bob are experienced inventors?
(1) "Say, Jack, do you have any idea that this thing is going to work?"
(2) "I don't know, Bob, the theory is all right, but how it will work out in practice is a cat of
another color; one thing is sure, though, and that is if it don't work we are out of the running in
the race, for the new boat the Jenkins boys have just bought, will run circles round the Sprite."
(3) "Well, we'll soon know, for it's about ready to test."
(4) This conversation took place one afternoon in the latter part of July in the basement of a
house in Skowhegan, Maine. The room was fitted up as a combined workshop and laboratory,
and a single glance would indicate that the two boys were by no means novices, for it
contained many expensive and intricate pieces of machinery.