In this question, 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 conclusion(s) logically follows/follow from the statements.
Statements:
(I) All ladders are chairs.
(II) All chairs are tables.
(III) No table is a stair.
Conclusions:
I. Some tables are ladders.
II. No chair is a stair.
III. Some ladders are stairs.

Statements:
I. All ladders are chairs.
II. All chairs are tables.
III. No table is a stair. 

I. Some tables are ladders. (Follows, Since all ladders are chairs, and all chairs are tables, it is clear that some tables are ladders.)
II. No chair is a stair.(Follows, Since chairs are inside the table set, and no table is a stair, it means no chair can be a stair.)
III. Some ladders are stairs.(Not follows, Since all ladders are inside the table set, and no table is a stair, it is impossible for any ladder to be a stair.)

Thus, the correct option is (c).