Final answer:
In 'The Crossover,' the metaphor 'Because our backboard is splintered' symbolizes that the team's unity and strength are compromised, signifying internal problems within the team.
Step-by-step explanation:
In the book The Crossover by Kwame Alexander, the metaphor "Because our backboard is splintered" is most accurately interpreted as b) The team's unity and strength are broken. This metaphorical language does not literally refer to the physical condition of the basketball court, but rather uses the image of a broken backboard to symbolize fractures within the team's cohesion or morale. A splintered backboard, which would be central to a game of basketball, suggests that something crucial to the team's success is damaged, which aligns with the unity and strength of the team being compromised.