From the given options, select the Figure of Speech (Poetic Device) used in the expression:

O friend! I know not which way I must look for, comfort.

Apostrophe

The correct answer is OPTION 1 Apostrophe.

Apostrophe is a figure of speech in which the speaker addresses an absent or inanimate object. In the expression "O friend! I know not which way I must look for, comfort," the speaker is addressing a friend who is not present. This creates a sense of intimacy and urgency, as the speaker is seeking comfort from their friend.

The other answer choices are incorrect. Oxymoron is a figure of speech in which two contradictory terms are used together. Personification is a figure of speech in which inanimate objects are given human qualities. Simile is a figure of speech in which two things are compared using the words "like" or "as." None of these devices are used in the expression "O friend! I know not which way I must look for, comfort."