They came to the mountain on the fifth day. . . . When the men in front reached the summit and caught sight of the sea there was great shouting. Xenophon and the rearguard heard it and thought that there were some more enemies attacking in the front. . . . Xenophon mounted his horse . . . and rode forward to give support, and, quite soon, they heard the soldiers shouting out, ‘The sea! The sea!’. . . . Then certainly they all began to run, the rearguard and all, and drove on the baggage animals and the horses at full speed; and when they had all got to the top, the soldiers, with tears in their eyes, embraced each other and their generals and captains.” —Xenophon,
as quoted in The Discoverers

How did Xenophon interpret the sound of shouting from the summit?
a.
His army had seen the sea.
c.
His army was under attack.
b.
His army was rebelling against him.
d.
His army had fallen ill.