The literary device used in line 1 is?

Read the extract and answer the question

My heart leaps up when I behold
A rainbow in the sky:
So was it when my life began,
So is it now that I am a man,
So be it when I shall grow
The child is father of the man

A. simile
B. alliteration
C. litotes
D. personification

Correct Answer:

Option D – personification