The sea is used as a symbol for life and its hardships.
Santiago's hand become a religious symbol in two ways. First, the wounds Santiago suffers on his palms are an obvious connection to Christ, especially his crucifixion.
The Mast symbolize the cross
A blank verse is a poem with no rhyme but does have iambic pentameter. This means it consists of lines of five feet, each foot being iambic, meaning two syllables long, one unstressed followed by a stressed syllable.
C because a suffix is at the end of a word