Approximately how much do contributors receive in Canada$/$Quebec Pension Plan benefits?

a$.$

A percentage of their average earnings times the number of years worked.

b$.$

$25\%$ of the their average monthly pensionable earnings during the contributory period.

c$.$

$25\%$ of the contributions from the employee and the employer.

d$.$

The average of the year's maximum pensionable earnings over the past five years, divided by $12.$