If They Spend All Night Writing Poems, Leticia Can Write

If they spend all night writing poems, Leticia can write 10 poems, and Isabella can write five. If they spend all night making necklaces, Leticia can make six, and Isabella can make four. We know that:

A) Leticia's opportunity cost of writing poems is less than Isabella's.
B) Leticia's opportunity costs of writing poems and of making necklaces are less than Isabella's.
C) Isabella's opportunity costs of writing poems and of making necklaces are less than Leticia's.
D) Isabella's opportunity cost of writing poems is less than Leticia's.