The reason why it is wrong to make a lying promise, according to kant, is because this act cannot be willed as a general practice without contradiction.
a) true
b) false

True

Explanation:

In Kartian ethics, the chapter 2 of the text titled Ethics for a level, Immanuel Kant is of the opinion that the reason why it is wrong to make a lying promise is because this act cannot be willed as a general practice without contradiction.

There are several individuals who make promises and keep them, thus a lying promise is not a general practice.