upvoting all<3;p

One day I wrote her name upon the strand,
But came the waves and washed it away:
Again I wrote it with a second hand,
But came the tide, and made my pains his prey.
“Vain man,” said she, “that dost in vain assay.
A mortal thing so to immortalize,
For I myself shall like to this decay.
And eek my name be wiped out likewise.”
“Not so,” quod I, “let baser things devise
To die in dust, but you shall live by fame:
My verse your virtues rare shall eternize,
And in the heavens write your glorious name.
Where when as death shall all the world subdue,
Our love shall live, and later life renew.”

In the opening quatrain, what action does the poet describe?
a)walking with his lover on the sand
b)trying to stop the advancing tide
c)writing his lover’s name in the sand