Which of these is most responsible for differences from the 20th century to the 21st century A. fuel efficient automobiles
B. low-cost computers
C student writing skills
D. solar heating devices ​

Which is the most accurate definition of a clause? a) a clause is any group of two or more words. b) a clause is a group of words with a subject and a verb. c) a clause is a group of words with a subject and a verb that can stand alone. d) a clause is a group of words with a subject and a verb that cannot stand alone.