Question

the text explains facts about the praying mantis.
a there is a praying mantis in my garden.
b the praying mantis is named for how it looks with its front legs folded.

Explanation:

The text is about facts of the praying mantis. Option A is a personal observation (there is one in the garden) which is not a general fact about the mantis. Option B explains a naming - related fact (how it gets its name from its front - legs appearance) which is a general fact about the praying mantis.

Answer:

B. The praying mantis is named for how it looks with its front legs folded.