Which of the following sort a dataframe by the order of the elements in B?

A) x[rev(x$B),]

B) x[order(x$B),]

C) x[ordersort(x$B),]

D) x[rev(order(x$B)),]

Correct Answer : x[rev(order(x$B)),]

Explanation : x[rev(order(x$B)),] sort the dataframe in reverse order.

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