Three statements are given followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:
I. All jewelleries are ornaments.
II. Some flowers are ornaments.
III. All plants are flowers.

Conclusions:

I. All plants are jewelleries.
II. Some ornaments are jewelleries.
III. Some flowers are plants.

​Statements:
I. All jewelleries are ornaments.
II. Some flowers are ornaments.
III. All plants are flowers.​

I. All plants are jewelleries. (Does not follow)

All plants are flowers, some flowers are ornaments & All jewelleries are ornament, it implies that All plants are jewelleries does not follow 

as plants and jewelleries do not have any direct relation.
II. Some ornaments are jewelleries. (Follows)

All jewelleries are ornaments, it implies that Some ornaments are jewelleries follows.
III. Some flowers are plants. (Follows)

All plants are flowers, it implies that some flowers are plants follows.

Thus, Option C is the correct answer.