Question

Which sentence contains a mechanical error?

The class opened its Writers Inc books to the chapter titled "Writing Basic Essays."
We were supposed leave Friday for our trip to Puerto Vallarta, Mexico, but we had to cancel.
Her birth records indicate she was born on November sixteenth, 1961.
Callie's piano lesson is at 4:00 P.M. every Monday and Wednesday.

Answer 1

I believe it is the third option. I feel like it should be written in numerical form, like November, 16, 1961.