How many teams contested the 1978-79 Yugoslav Second League?

A. Eleven teams from the 1977-78 season, one relegated from the First League, and four promoted from the Third League
B. Twelve teams from the 1977-78 season and two promoted from the Third League
C. Fifteen teams from the 1977-78 season and one promoted from the Third League
D. Ten teams from the 1977-78 season, two relegated from the First League, and four promoted from the Third League
Answer: 