Assertion (A): : Icebergs, which are a solid form of water,

Assertion (A): : Icebergs, which are a solid form of water, float on water in the seas.
Reason (R1):
Icebergs have two-thirds of their mass under water and the other third visible above the surface.
Reason (R2):
Icebergs are heavier than water and displace water of the seas, making them float.

1. If only reason 1 (R1) and not reason 2 (R2) is the reason for the assertion (A).
2. If only reason 2 (R2) and not reason 1 (R1) is the reason for the assertion (A).
3. If both (R1) and (R2) are reasons for the assertion (A).
4. If neither (R1) nor (R2) is the reason for the assertion (A).

R2 is incorrect and R1 is correct but not the reason for floating of the iceberges.