"it all started when we identified our core values last Friday"

Question

What needs to be changed
A. Change started to starting
B. insert a comma after values
C. delete the quotation marks after friday

Answer 1

The sentence can be improved by making the following change:

B. Insert a comma after "values."

The corrected sentence would be: "It all started when we identified our core values, last Friday."

Option A (changing "started" to "starting") would not be appropriate without further context, and option C (deleting the quotation marks) is not necessary unless the sentence is part of a larger text that requires it.