(UNISC - 2021)The poet Dylan Thomas wrote that one

(UNISC - 2021)

The poet Dylan Thomas wrote that one should not go gently into that food night, that old age should burn and rage at close of day. As a younger man reading that poem, I saw futility in those words. I saw aging only as a failing: a failing of the body, of the mind, and even of the spirit. I saw my ²grandfather suffer aches and pains. Once agile and proudly self-sufficient, by ¹his sixties he struggled to swing a hammer and was unable to read a label on a box of Triscuit crackers without his glasses. I listened as my grandmother forgot words, and I cried when eventually she forgot what year it was.

At work, I watched as ⁴people neared retirement age, the spark gone from their eyes, the hope from ³their smiles, counting the days until they could walk away from it all, yet with only the vaguest plans about what they would do once they had so much free time, all day, every day. But as I've grown older myself, and have spent more time with people who are in the last quarter of their lives. I've seen a different side of aging. My parents are now in their mideighties and are as engaged with life as ⁵they have ever been, immersed in social interactions, spiritual pursuits, hiking, and nature, and even starting new ⁶professional projects.

Adapted from LEVITIN, Daniel. Succesful aging: a neuroscientist explores the power and potential of our lives. New York: Dutton, 2020.

Consider the following statements.

I. The word his (ref. 1) refers to grandfather (ref. 2).

II. The word their (ref. 3) refers to people (ref. 4).

III. The word they (ref. 5) refers to professional projects (ref. 6).

Which ones are correct?