C. Portuguese base in Panaji (Goa):

• The Portuguese established their presence in Goa in the early 16th century after the arrival of Vasco da Gama in 1498. Panaji became a significant base during the Portuguese colonial period.

A. Dutch base in Masulipatnam:

• The Dutch East India Company established a trading post in Masulipatnam (present-day Machilipatnam) in the early 17th century, around 1605.

D. British base in Madras (Chennai):

• The British East India Company established Fort St. George in Madras in 1644. It became a significant British trading center and administrative hub in South India.

B. French base in Pondicherry:

• The French East India Company established a trading post in Pondicherry in 1674. It became a notable French settlement in India during the colonial period.

So, the correct option is [4].