The main conclusion isn’t about the suspension of disbelief. The main conclusion concerns the way in which amateurism and artistry combine in Cameron’s pictures to make them interesting. The suspension of disbelief is discussed as part of what makes Cameron’s pictures interesting.

This is the best answer. The discussion of suspension of disbelief introduces a contrast between being aware of double personas (in photos) and being able to suspend our awareness of these personas (in painting and theater). The author uses this contrast to help describe the way we respond to Cameron’s pictures.

The author doesn’t present a negative opinion about narrative photography. The author doesn’t present our inability to suspend disbelief with narrative photography as something negative.

The author doesn’t try to rebut a criticism of Cameron or show that a criticism is confused. The only person who gives an opinion about Cameron’s work in this passage is the author.

The author’s conclusion isn’t that Cameron’s pictures are more like drama than like narrative painting.