Comparing the information in the question with I. we find that 'tin' and 'lee' are the codes for 'always' and 'keep'.
So. 'pee' represents 'smiling' Thus, I alone is sufficient.
Comparing the information in the question with II, we find that the common code word 'pee' stands for the common word 'smiling'.
Thus, II alone is also sufficient.
option C