That Time of Year Thou Mayst in Me Behold

That time of year thou mayst in me behold
When yellow leaves, or none, or few, do hang
Upon those boughs which shake against the cold,
Bare ruin'd choirs, where late the sweet birds sang.
In me thou see'st the twilight of such day
As after sunset fadeth in the west;
Which by and by black night doth take away,
Death's second self, that seals up all in rest.
In me thou see'st the glowing of such fire,
That on the ashes of his youth doth lie,
As the death-bed, whereon it must expire,
Consum'd with that which it was nourish'd by.
This thou perceiv'st, which makes thy love more strong,
To love that well, which thou must leave ere long.
-What observations does the speaker assume the lover has made?

A) The speaker assumes the lover has noticed the changing of the seasons.
B) The speaker assumes the lover has noticed it is growing colder.
C) The speaker assumes the lover has noticed he, the speaker, is growing old.
D) The speaker assumes the lover has noticed he, the speaker, is less active than he once was.