In a days work,the employees met their goals for the week.

a days"
b employees'
c day's
d employee's

i think it is C

The thing that needs correcting?

Yes, C.

yes. Thank you

You are correct! The correct answer is C, "day's."

To explain how to arrive at the answer, let's break down the problem:

The sentence is referring to a particular day (singular) and its work. To show possession or ownership of the work by the day, we need to use an apostrophe after the word "day."

Now, let's examine the options:

a) "a days" - This option is incorrect because it doesn't use an apostrophe after "day." It also uses the plural form of "day," which is not suitable in this context.

b) "employees'" - This option is incorrect because it implies possession by multiple employees. The sentence is referring to the work of a single day, not multiple employees.

c) "day's" - This option is correct. It follows the rules of possessive apostrophes and shows the work's ownership by a singular day.

d) "employee's" - This option is incorrect because it implies possession by a single employee. Again, the sentence is referring to the work of a single day, not an individual employee.

Thus, the answer is C, "day's."