After two __ training, you may be ready for a promotion. a. years' b. years c. year's

The correct answer is **a. years'**.This is because the word "training" is being modified by the word "two years." Since it's more than one year, we use the plural "years." The apostrophe after "years" indicates possession – the training *belongs* to the two years. It's like saying "training of two years."