D is the correct answer. All other sentences have some punctuation errors.
I dont know but I would eject
The PAST PROGRESSIVE TENSE indicates continuing action, something that was happening, going on, at some point in the past. This tense is formed with the helping "to be" verb, in the past tense, plus the present participle of the verb (with an -ing ending): I was riding my bike all day yesterday.
Synonym of imprudent is unwise.