Which statement contains an ironic use of understatement?

Responses

The boys were so exhausted after the long flight that they slept for hours.
We watched the different floats of the parade pass by for what seemed like an eternity.
I studied so hard for the test, I almost memorized the information written on my note cards.

The pilot called flying from one side of the Atlantic to the other a simple task of "puddle jumping."

The pilot called flying from one side of the Atlantic to the other a simple task of "puddle jumping."