Source: Knewton

Members of the Araneomorph funnel-web spider family spin unusually shaped webs, in which tightly woven strands funnel trapped insects into a central hole. Because spiders within this family spin virtually identical webs, despite living on multiple continents, arachnologists believe that funnel web-spinning behavior is genetically innate and not culturally acquired.

Which of the following, if true, would most strengthen the conclusion drawn by the arachnologists?

A: Australian funnel-web spiders, the most commonly studied Araneomorph, show less variation in their web-spinning style than does any other species of spider native to that continent.
B: In the laboratory, newborn Araneomorphs exposed only to spiders that spin spiral orb webs nonetheless spin funnel webs.
C: One species of Araneomorphs spins its funnel webs around the bases of tree trunks, while another spins its webs in burrows on the ground.
D: Araneomorphs live in tightly-knit cultural communities, and are known to both spin webs and raise young spiders communally.
E: It is well known that many spiders' egg-tending behaviors are transmitted genetically rather than learned.

I selected E but OA is B.

What B is trying to convey?