How many punctuation marks are required in this unedited sentence below?

Professor Gray Mr Michaels Dr Gunn and Ms Foster usually arrived at the office by 830 a m.

Group of answer choices

6

4

5

7

The correct answer is 4.

The unedited sentence provided is: "Professor Gray Mr Michaels Dr Gunn and Ms Foster usually arrived at the office by 830 a m."

To determine the number of punctuation marks required, we should consider:

1. Comma after "Gray": Professor Gray, Mr Michaels, Dr Gunn, and Ms Foster usually arrived at the office by 830 a.m.
2. Comma after "Michaels": Professor Gray, Mr Michaels, Dr Gunn, and Ms Foster usually arrived at the office by 830 a.m.
3. Comma after "Gunn": Professor Gray, Mr Michaels, Dr Gunn, and Ms Foster usually arrived at the office by 830 a.m.
4. Comma after "Foster": Professor Gray, Mr Michaels, Dr Gunn, and Ms Foster usually arrived at the office by 830 a.m.
5. Period (full stop) after "a.m.": Professor Gray, Mr Michaels, Dr Gunn, and Ms Foster usually arrived at the office by 8:30 a.m.

Therefore, the correct answer is 5 punctuation marks.