Let's recall the definition of clustering 
coefficient. The clustering of a node is

the fraction of all possible pairs of 
friends that are friends with each other.

So Dan has two friends, Sara and Alan. 
And they're not friends with each other.

So Dan's clustering is 0. The same for 
all the other nodes. They all have the

same situation. So if we take the average 
of all those, it's just 0. So that's the

clustering coefficient. However, if we 
look at this network, now that a single

link has been rewired. You can see that 
Lynn and Jane still have clustering of 0.

Each one of them has a 0. Ok, Sara has 
three friends, so there's 3 possible

pairs: Jane to Dan, Jane to Alan, and 
Alan to Dan, and only one of those

actually is a friendship link. So Sara 
has a clustering of 1/3. Ok, Dan has 2

friends, and they're linked. So his 
clustering is 1. All of his friends are

linked. They're friends with each other. 
Alan is in the same boat - he has two

friends, and his friends are friends, so 
he has 1. Now, if you take the average of

1,1, 1/3, 0, and 0, you get 0.47. So 
that's the answer, here.