Read the clue from the text and the background knowledge statement.

Clue from the text: “A woman is smiling while she is reading a letter.”

Your background knowledge: “People smile when they are happy.”
Which inference can be made using these statements?

Information in the letter is frightening the woman.
Information in the letter is making the woman happy.
Information in the letter must be learned by the reader before an inference can be made.
Information in the letter has had no effect on the woman’s level of happiness.