What type of spiders build webs and leave them behind?

The correct choice highlights cobweb-weaving spiders, also known as cobweb spiders, which are characterized by their ability to construct irregular webs in corners or sheltered areas. These webs are often left behind when the spider departs, typically because they are not actively hunting or because they have moved on to a new location.

Cobweb-weaving spiders focus on building these sticky, tangled webs that can capture a variety of prey, and are commonly found in domestic environments where they may be more visible to people. Their webs can remain intact for long periods if not disturbed, which contributes to the notion that they "leave them behind."

Other types of spiders mentioned, such as jumping spiders and orb weavers, do not typically fit this description. Jumping spiders, for instance, do not spin webs for trapping prey but instead rely on their agility and eyesight to hunt. Orb weavers create distinct, circular webs, but they tend to consume their webs at times to recycle the silk. While web-spinning spiders is a broader category that includes various types of spiders that construct webs, cobweb-weaving spiders specifically focus on the kind of web structure that is most recognizable as abandoned when left behind.