Me
which sentences are they? ?

The sentence beginning "If that isn't enough ... "

That's very provocative. It means that If you haven't got enough evidence yet, here's one more thing ['...and we can see it right now.' This isn't there, but it is intended].

The last sentence is very emotional in its appeal compared to many of the others. These two are for sure. You don't want to list too many.

d is the best answer for this question.

recent brain research has shown some surprising benefits as a result of formal musical training. learning to play a musical instrument appears to develop parts of the brain that can even influence academic results. the studies indicate that the earlier a child begins training, the more benefits there are. one such study showed that children who began musical studies before the age of seven had a more developed brain in the region where language production and auditory processing take place. scientists believe there is mounting evidence to show that early musical training can improve brain function.

explanation: