The little engine was high in self efficacy .
Out of the given options, the one that fits the little train best is the high in self-efficacy option. Self-efficacy is the belief of a person in one’s abilities to succeed and overcome a specific obstacle or accomplish a certain task.
With the little train telling itself repeatedly that it thinks it can, it is promoting self-efficacy in itself increasing his belief that he can accomplish the task of pulling the heavy train up the steep mountain, thus making option c the correct answer.