Answer: The correct answer for the blank is-
B. blinking.
Learning can be described as a process of modification in the behaviour of an organism that is developed through experience or training.
Learned behavior can be developed through various means such as observation, play, classisal conditioning, sensitization etc.
In the given question, shyness, angry response, and biting of nails can shaped/modiglfi through learning.
But blinking of eyes is an innate behavior that can does not require any learning or practice.
Thus, option B) is the right answer.