Lewis-isms

The response given by the landowner is:

(a) Don't I have the right to do what I want with my own money? Or (b) are you envious because I am generous?'

Now isn't this a classic case of Lewis-ism? Ie, providing two possible solutions to a question where there are more than two solutions.

The workers are grumbling because they wished they had only worked a short time rather than the whole day.

Questions:

1. How is someting Jesus said a "Lewis-ism?"
2. How do you know your interpretation is correct?