The statement that best illustrates why dreams fail in the context of the metaphor of the bark in the poem is:
3. Failure is caused by insufficient resources.
The poem describes how the speaker's "sails" are "too weak to bear the blast," suggesting that the bark (representing the speaker's efforts or dreams) lacks the necessary strength or resources to withstand the challenges and external conditions (the storm and tempests). This implies that despite the desire to achieve the dream, the insufficient resources ultimately lead to failure.