what is the partitioning criteria?

In this SQL statement, what is the partitioning criteria?
CREATE TABLE books_part
PARTITION BY RANGE (cell_id) (
PARTITION p0l VALUES LESS THAN (2),

PARTITION p02 VALUES LESS THAN (3) ,
. . .
PARTITION pl4 VALUES LESS THAN (15),
PARTITION pl5 VALUES LESS THAN (16),
PARTITION pl6 VALUES LESS THAN (MAXVALUE)
)
AS SELECT * FROM books;

A.
books

B.
pxx

C.
MAXVALUE

D.
cell_id

E.
There is no partitioning criteria.