Which one of the following is a part of the Congo Basin?

In February 2023, an international summit in Gabon addressed the alarming rate of tropical forest loss, with a focus on the Congo Basin.

The Congo Basin stores more carbon than the Amazon and contains the world's largest tropical peatlands, storing approximately 29 billion tons of carbon, equivalent to about three years' worth of global greenhouse gas emissions. The basin absorbs nearly 1.5 billion tons of carbon dioxide annually.

The Congo Basin spans six countries: Cameroon, Central African Republic, Democratic Republic of the Congo, Congo, Equatorial Guinea, and Gabon.

Since Cameroon is one of the six countries, it is part of the Congo Basin.

Hence, option (a) is the correct answer.