pls answer with explanation

Dear Student,

The position of the ovary with respect to the floral parts is used to classify the flowers into hypogynous, perigynous and epigynous flowers.
So, option B) is correct: ovary with respect to petals.

As per the diagram given in question:
I depicts the hypogynous flower
II depicts the perigynous flower.
III depicts the epigynous flower.

Ovary type	Flower	Position	Example of Families
Superior	Hypogynous	When the ovary arise from above the floral parts (sepals, petals and androecium)	Solanaceae
Half-inferior	Perigynous	When the floral parts arise from same position	Rosaceae (Rose), passifloraceae
inferior	Epigynous	When the ovary arise from below the floral parts.	Cucurbitaceae, Asteraceae

Regards