Final answer:
The only means of preserving beauty according to Shakespeare's Sonnet 3 is through procreation (B), as it allows one's legacy and image to be carried on by their children.
Step-by-step explanation:
The lines from William Shakespeare's Sonnet 3 suggest that the only means of preserving beauty is through B. procreation. The sonnet implies that one's physical beauty is fleeting, and the only way to immortalize it is by having children who will carry on one's image and legacy.
The final couplet, 'But if thou live, remember'd not to be, Die single, and thine image dies with thee,' clearly emphasizes that if one does not procreate, their beauty will not survive after death.