To perform consistency checks on a MyISAM table the statement is . . . . . . . .

CHECK TABLE: This is the correct option. The CHECK TABLE statement in MySQL is used to perform consistency checks on tables. When applied to a MyISAM table, it checks for errors in the table's structure and data integrity.
REPAIR TABLE: This option is incorrect. The REPAIR TABLE statement is used to repair corrupted MyISAM tables. While it can fix issues identified by the CHECK TABLE statement, it is not specifically for performing consistency checks.
ANALYZE TABLE: This option is incorrect. The ANALYZE TABLE statement is used to analyze and update table statistics for query optimization purposes. It is not primarily used for performing consistency checks.
OPTIMIZE TABLE: This option is incorrect. The OPTIMIZE TABLE statement is used to defragment tables and reclaim wasted space. It is not primarily used for performing consistency checks.

Therefore, to perform consistency checks on a MyISAM table, the statement to use is Option A: CHECK TABLE.