Will give brainlist :)

try option the last one

oil exploration takes a large part of the country's budget

if you get two tries try option two

oil sales are a major part of the country's income.

Explanation:

it's

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.