Which photographic technique did the artist use to show movement? Implied
Vertical lines
Leading the eye
Simple background

I feel that "Leading the eye" is the correct answer.

Explanation:

The swirl of the shell leads your eye to the bright yellow center.

Vertical lines: This cant be correct because there are no vertical lines.

Leading the eye: This is likely the correct answer because of what i stated above.

Simple background: There is no background

I really hope this helps! I took photography class not long ago and loved it, would do it again!