Answer:
The first "No sé la capital de Nicaragua, pero puedo hacer una búsqueda para saberla" is the correct answer.
Step-by-step explanation:
The second answer means "I don’t know the capital of Nicaragua, but i can be online to know it"
The third answer means "I don’t know the capital of Nicaragua, but i can find a book to know it"
The last answer means "I don’t know the capital of Nicaragua, but i can use a computer to know it"