Select the sentence from the paragraph that BEST supports the theme of the text.
Most of them walked into the water as though into a native element. The sea was quiet now, and swelled lazily in broad billows that melted into one another and did not break except upon the beach in little foamy crests that coiled back like slow, white serpents.
Edna had attempted all summer to learn to swim. She had received instructions from both the men and women; in some instances from the children. Robert had pursued a system of lessons almost daily; and he was nearly at the point of discouragement in realizing the futility of his efforts. A certain ungovernable dread hung about her when in the water, unless there was a hand near by that might reach out and reassure her.
But that night she was like the little tottering, stumbling, clutching child, who of a sudden realizes its powers, and walks for the first time alone, boldly and with over-confidence.