A country imports $15 billion worth of goods and services, while its sales of goods and services to other country is $18 billion. If it's net primary income is $4 billion and net secondary income is $1 billion then it has

Select one:

a.$8 billion surplus in its current account.

b.$6 billion surplus in its current account.

c.$11 billion surplus in its current account.

d.deficit of $38 billion in its current account.