What research are the speakers talking about?

Listen to the conversation, mark each question as A, B, C or D according to your listening.
W: Rob, today we’re talking about new research into the differences between men’s and women’s brains. This research says that men are better at some things, like reading maps.
M: Yes, I’m good at reading maps and even my wife would agree.
W: But women are better at other things, like remembering faces. That’s according to this research. By the way, do you know how much the average human brain weighs?
M: I really don’t know.
W: It’s 1. 4 kilograms. This compares with the average of 7 kilograms for whales and 1. 4 kilograms for dolphins. Albert Einstein’s brain was only 1. 2 kilograms: that’s lower than average, so size isn’t everything.
M: Yes.
W: This research was conducted by a team from the University of Pennsylvania in the US. They looked at the brains of nearly 1,000 men and women and found they were wired differently.
M: What’s the difference?
W: They found that in males, the stronger connections run within each hemisphere. In women the stronger connections are between the two sides of the brain.
M: So men have better links. Women have stronger connections between each side. But what does that mean?
W: Well, they say these differences might explain why men are better at learning and performing a single task, like cycling or navigating, and why women are often better at multi-tasking. The research also showed women are better at remembering words, faces and information about other people, and they also have longer attention spans.
M: It’s very interesting.