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What theme is conveyed in this poem?

Invictus
William Ernest Henley

OUT of the night that covers me,
Black as the Pit from pole to pole,
I thank whatever gods may be
For my unconquerable soul.

In the fell clutch of circumstance5
I have not winced nor cried aloud.
Under the bludgeonings of chance
My head is bloody, but unbowed.

Beyond this place of wrath and tears
Looms but the Horror of the shade,10
And yet the menace of the years
Finds, and shall find, me unafraid.

It matters not how strait the gate,
How charged with punishments the scroll,
I am the master of my fate:15
I am the captain of my soul.

A) The poem addresses the theme of the inevitability of death.

B) The poem addresses the theme of the power of being invincible.

C) The poem addresses the theme of the many exciting, mysteries of night and darkness.

D) The poem addresses the theme of the strength of will necessary to survive severe tests in life.

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