What evidence supports the idea that the narrator's motivation is intrinsic?

Asked an incomplete question. Here's the full question:

What evidence supports the idea that the narrator's motivation is intrinsic?

Read the passage from "Two Kinds."

Last week I sent a tuner over to my parents' apartment and had the piano reconditioned, for purely sentimental reasons. My mother had died a few months before and I had been getting things in order for my father, a little bit at a time. I put the jewelry in special silk pouches. The sweaters she had knitted in yellow, pink, bright orange-all the colors I hated-I put those in moth-proof boxes. I found some old Chinese silk dresses, the kind with little slits up the sides. I rubbed the old silk against my skin, then wrapped them in tissue and decided to take them home with me.

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A. "Last week I sent a tuner over to my parents' apartment and had the piano reconditioned, for purely sentimental reasons."

B. "My mother had died a few months before and I had been getting things in order for my father, a little bit at a time."

C. "I put the jewelry in special silk pouches. The sweaters she had knitted in yellow, pink, bright orange-all the colors I hated-I put those in moth-proof boxes."

D. "I found some old Chinese silk dresses, the kind with little slits up the sides."

Explanation:

The correct answer is;

A. "Last week I sent a tuner over to my parents' apartment and had the piano reconditioned, for purely sentimental reasons."

Note that intrinsic motivation is a motivation that is triggered from within (internally) of an individual. Here the intrinsic factor of motivation according to the narrator is "purely sentimental reasons."