What was the main concern for portuguese explorers in brazil?
a) colonization
b) conquering native tribes
c) finding any usable resources for trade or agriculture
d) finding a land route to the indies

The main concern for Portuguese explorers in Brazil was finding any usable resources for trade or agriculture

Thus the correct answer is Option C.

Explanation:

Portuguese started to migrate from Brazil in search of economic opportunities. Portuguese population increased in Brazil. People were mostly countryside farmworkers and they settled in urban areas in Brazil as minor traders, retailers, gatekeepers and cobblers.  

Due to internal civil wars and upheavals in Portugal there was huge evacuation of people to Brazil. The World War I and the great depression temporarily halted the immigration.  

Many Portuguese opened bars, restaurants and small scale industries in Brazil to earn their livelihood and gradually the immigration dwindled.

small european communities with shared traditions consolidated into large new states (apex)