Though I'm not entirely certain, I'm pretty sure your answers are correct.
The line of the poem which expresses the theme that youth passes quickly is:
“ But only so an hour”
The poem “Nothing Gold Can Stay,” by Robert Frost is about the inevitability of things which are beautiful and soothing. Frost explores the theme that although youth is beautiful and charming, it will be lost someday. He shows this change with the examples taken from nature. He adds that the flowers which bloom in spring season will be lost and the children will grow and turn into adults. He takes the example of the Fall of man to show that every beautiful thing can be turned down.
Answer: On October 1st, 1975, my mother was born.
Explanation: There are no answers to the choices you have but this is how you write it.
