Answer:
According to the passage, if the clay is too wet, it should be spread out flat to dry for a while.
The relevant sentence from the passage is: "If the clay is too wet, spread it out on a plaster bat or on a sheet of paper for a while to dry it to the right consistency." (Paragraph 3)
Therefore, option 2, "Spread it out flat to dry for awhile" is the correct answer.