In the following question, a sentence has been given in Direct/Indirect speech. Out of the four alternatives suggested, select the one which best expresses the same sentence in Indirect/Direct speech.

The teacher said, "Nobody can solve the problem."

A

The teacher said that nobody can solve the problem.

B

The teacher said that nobody should solve the problem.

C

The teacher said that somebody can solve the problem.

D

The teacher said that nobody could solve the problem.