A 2008 Twin Study by Nicolaou and Shane Using 870

A 2008 twin study by Nicolaou and Shane using 870 pairs of identical twins and 857 pairs of same-sex fraternal twins to study entrepreneurial activity found that entrepreneurs are

A) 100 percent made.
B) about 50 percent born and 50 percent made.
C) 100 percent born.
D) about 80 percent born and 20 percent made.
E) about 40 percent born and 60 percent made.