Concept:The underlined letter must represent the same consonant sound in the answer word as it does in the given word.Explanation:"Banked" is pronounced /bæŋkt/.Here, the underlined letter "k" has the consonant sound /k/.Now compare the consonant sounds in the options:• "led" ends with /d/, not /k/.• "filed" ends with /d/, not /k/.• "ludo" contains /l/ and /d/, not /k/.• "taken" is pronounced /’teik@n/ and clearly contains the /k/ sound.Therefore, the correct option is "taken."Answer:C. taken