They've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they geThey've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they get

They've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they geThey've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they get
They've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they ge
They've written down some ideas____ good ideas
a.about how getting
b.on how to get
c.in how they get

They've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they geThey've written down some ideas____ good ideas a.about how getting b.on how to get c.in how they get
on和about 都可以,表示关于的意思.
然后重要的是后面的how to,是用来表示方法.
因此选 B.