The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.
Such are the strata which we
X-species as those now living in the Mediterranean
Y-meet with in the south of Sicily, filled
Z-with shells for the most part of the same

A

YXZ

B

XZY

C

XYZ

D

YZX