In a certain code, '247' means 'spread red carpet' ; '256' means 'dust one carpet' and '234' means 'one red carpet'. Which digit in that code means 'dust' ?

C. 5

In a certain code language, '134' means 'good and tasty';
'478' means 'see good pictures'  and
'729' means 'pictures are faint'.
Which of the following digits stands for 'see' ?

D. 8

In a certain code, '256' means 'red colour chalk' ; '589' means 'green colour flower' and '245' means 'white colour chalk'. Which digit in that code means 'white' ?

B. 4