Help me please this is confusing.

yea and yea x.x i love them =^-^=

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:

i think the answer would mist likely be an adjective clause, because unhappy is an adjective.

answer: a

explanation: a because she needs to study for her test and get grades for it