The country of Guyana:.
a) was formerly a British colony before independence in 1966
b) is also called Suriname contains
c) a population that is three-quarters European
d) is the smallest of the four Guianas in population size
e) still belongs to France

Right choice is:

a) was formerly a British colony before independence in 1966 .

Explanation:

The Co-operative Republic of Guyana is the only English-speaking country of the South American mainland.  It has an area of 214, 970 square km. Its population is around 784,000 inhabitants (2018 estimate). The capital is Georgetown.

it increased 6 percent and reached that in 1980

i can't beat you to a pulp if i'm not close enough.