SSC Steno Grade C and D 11 Dec 2024 Shift 2 Paper

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow from the statements.
Statements:
Some balloons are nitrogen.
All balloons are hydrogen.
All hydrogens are helium.
Conclusions:
I. All balloons are helium
II. All nitrogens are heliums.
III. Some heliums are nitrogen.