Final answer:
Juliet's willingness to love a loathed enemy supports the inference that she will pursue her interest in Romeo.
Step-by-step explanation:
The line from the text that supports the inference that Juliet will pursue her interest in Romeo is D. Prodigious birth of love it is to me, That I must love a loathed enemy. This line indicates that Juliet is willing to pursue her love for Romeo despite the fact that he is a member of the Montague family, who are enemies of her own Capulet family.