Step-by-step Solution:

Let's analyze the given information step by step:

1. '134' means 'good and tasty'
2. '478' means 'see good pictures'
3. '729' means 'pictures are faint'
Now, let's identify common words and their corresponding numbers:

- 'good' appears in '134' and '478', so the common number must represent 'good'.
- The common number between '134' and '478' is '4', so '4' represents 'good'.
- 'pictures' appears in '478' and '729', so the common number must represent 'pictures'.
- The common number between '478' and '729' is '7', so '7' represents 'pictures'.
- Now, in '478', we already identified '4' as 'good' and '7' as 'pictures'.
- The remaining number in '478' is '8', which must represent 'see'.
Thus, the correct answer is: C. 8