A and D both talk about “balance”.
But D starts with “even”, implying the D follows A.
B mentions “the loss of a particularly big iceberg or through disintegration of an ice shelf” and C explains the phenomena of disintegration of an ice shelf.
This implies C follows B. As a phenomenon is always mentioned first and then explained.
B starts with “But sometimes ice sheets destabilize…” which implies that it is not the first in the sequence.
So, we know that, D comes after A, C comes after B, and that B is not the first in the sequence.
Therefore the sequence is ADBC.
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