The past progressive is most useful when?
a. when an action happened in the past
b. when an action was uninterrupted in the past
c. when an uninterrupted action happens
d. when an action gets increasingly common
i have read that past progressive are interrupted actions so that only leaves a anddoes anyone know the correct answer

d. when an action gets increasingly common: p

to persuade readers which is answer c

in the 1890s, southern states enacted a new form of black codes, called “jim crow” laws. these laws made it illegal for blacks and whites to share public facilities. this meant that blacks and whites had to use separate schools, hospitals, libraries, restaurants, hotels, bathrooms, and drinking fountains.

explanation: