A= "Oracle Database stores rows as variable-length records. A row is contained in one or more sections. Each section is called a row piece. Each row piece has a row header and column data."
C would have been correct, if the key word ONLY was not used, as there are other factors which will cause row chaining.
"Row chaining most often occurs with large rows. Examples include rows that contain a column of data type LONG or LONG RAW , or a row with a huge number of columns. Row chaining in these cases is unavoidable."
-https://docs.oracle.com/database/121/CNCPT/logical.htm#CNCPT1061
C and E correct answers if the number of rows are more than 255 oracle starts to create other row and it chain rows for net time block read. row can be a single block if it has small
data
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