During the summer months, buildings in Helsinki, Finland- a country that draws over 34 percent of its energy from renewable sources- (is/are) cooled by an artificial underground lake that contains nine million gallons of icy water.

Are

Explanation:

According to subject verb agreement rule of grammar, Singular subject should take singular verb and plural subject should take plural verb.

For example boy is eating apple--

boys are eating apple

In the sentence mentioned above first we have to identify the subject to which  is/are should agree with

subject is  Buildings in Helsinki which is a plural noun and hence are is the correct verb to be used with buildings.

answer: d

explanation:

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: