Which of the following sentences is punctuated correctly? a. henry, decided not to study, for the test; he regretted his decision 10 minutes after he began taking the test. b. henry decided not to study for the test, he regretted his decision 10 minutes after he began taking the test. c. henry, decided not to study for the test; he regretted his decision: 10 minutes after he began taking the test. d. henry decided not to study for the test; he regretted his decision 10 minutes after he began taking the test.