单选题：Why was there a delay on the day of the experiment____?

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题目内容：
Why was there a delay on the day of the experiment____? A．Because hungry people needed time to fill their stomach.
B．Because Radel wanted to create two groups of testees, hungry and non-hungry.
C．Because noon was not the right time for any experiment.
D．Because Radel needed time to select participants in terms of body mass index.

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