In order to determine Bolivia's exports, we need to sum up the export amounts for both goods and services.
From the table:
- Goods sold abroad (exports) = $10 billion
- Services sold abroad (exports) = $25 billion
Now we add these two amounts together:
\[ \text{Total Exports} = \text{Goods Exports} + \text{Services Exports} = 10 \text{ billion} + 25 \text{ billion} = 35 \text{ billion} \]
Thus, Bolivia's total exports amount to $35 billion.
The correct answer is: b. $35 billion