After each of the following sentences, a list of possible interpretations is given. Choose the interpretation that you consider most appropriate for each sentence.
We wanted to arrive early so we decided to leave at 10 0'clock at the latest. This means that we

A. must leave at 10 0'clock exactly
B. should not leave later than 10 0'clock  
C. should not leave before 10 0'clock
D. must leave about 10 0'clock

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Correct Answer: B