Passage Summary: Bugs use UV light to find what they need, and they happen to fly toward spiderwebs that reflect UV light, so the light is likely the lure.

Conclusion: Insects are drawn to Glomosus spiderwebs specifically due to the ultraviolet light patterns the webs reflect.

Reasoning: Insects use ultraviolet light to find food and mates, and since Glomosus webs reflect this light and attract insects, the light must be the cause of the attraction.

Analysis: The argument identifies a correlation between the UV reflection of the webs and the attraction of the insects, then leaps to a causal conclusion. To strengthen this, we need to bridge the gap between 'the webs reflect UV' and 'the insects are coming *because* of the UV.' Look for an answer that rules out other attractants, like scent, or one that shows the insects' behavior changes when the UV light is removed. If insects ignore the webs when the UV reflection is blocked, the argument becomes much more convincing.