Double counting in the national income accounts will be avoided if gdp is computed by totaling all:
a. sales of final output.
b. sales of final output and intermediate goods.
c. sales.
d. production costs.

A. sales of final output.

Explanation:

GDP is an expression of a country's size of the economy.  It is a  measure of the total value of a country's output in a specific period.  In calculating the GDP, economics will consider the total of final goods and services produced in an economy, multiply them by their prices and sum them up.

Double-counting describes a situation where some goods and services are counted more than once when computing GDP. Economists consider only the final output in calculating GDP. Not using intermediate goods avoids double-counting. Intermediate goods are not final products. They are used to produce more goods and services.

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