The correct answer is (A) To walk with a swinging manner; to move with a gliding gait; to swagger along in an attention-seeking fashion; to stroll nonchalantly with a sideways rocking motion.

Sashay comes from French chassé (dance step).

Examples of use:

• She sashayed down the aisle and paused at the second row
• He sashayed through the mall with his pants low and hat backward.