The detail in the illustration which is also expressed in the passage is that Heidi is feeling happy about sledging down the hill.
This is known as the action or fact of illustrating something. It is also a picture or diagram which helps to make something clear or attractive.
Hence, detail is an individual fact or item meant for providing supporting evidence.
Note that this question is incomplete as there was no illustration given, therefore, a general overview is given to guide you in answering.
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The complete question.
Select the correct answer.
What detail in the illustration is also expressed in the passage?
A.Grandfather feeling happy about sledging down the hill
B. Heidi felt happy about sledging down the hill
C.Grandfather takes Heidi to see her grandmother
D.Heidi wearing a red blanket to protect her from the cold