In much of the country, homeowners choose to heat their houses with either natural gas or heating oil, both of which are normal goods. which factor would cause an increase in the demand for natural gas? a.) an increase in consumer incomes b.) an increase in the price of natural gas c.) a decrease in the price of heating oil d.) a decrease in the price of natural gas a.) an increase in consumer incomes

a.) an increase in consumer incomes.

Explanation:

The natural gas and heating oil is considered as normal goods.Every person in the country cannot use theses goods on daily basis.So the increase in demand for the natural gas can be due to the increase in the incomes of the consumers so that they could afford these items for daily use.

Hence the answer is option a.

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.