Read the passage:

Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light.

Though wise men at their end know dark is right,
Because their words had forked no lightning they
Do not go gentle into that good night.

What is the effect of the extended metaphor in the passage?

It sustains the comparison of death to night.

It sustains the image of night.

It sustains the image of old age.

It sustains the comparison of night to day.