If a rider is attached to a bill, it must be introduced before the First reading. hence, option A is the correct statement.
The first reading of a bill refers to the first stage of Bill's passage through the House of Commons as part of a formality. "first reading" includes various stages that a bill is subjected to as it goes through the process of becoming legislation.
Therefore, If a rider is attached to a bill, it must be introduced before the First reading. hence, option A is the correct statement.
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