What type of sentences are these?

the teacher walked into the classroom, greeted the students, and took attendance.
select one:
a. simple
b. compound
c. complex

while juanita went shopping, juan played football.
select one:
a. simple
b. compound
c. complex

mexico has the better football team, but it lost this time.
select one:
a. simple
b. compound
c. complex

the island was filled with many trails winding through the thick underbrush, a small lake, and dangerous wild pigs.
select one:
a. simple
b. compound
c. complex

joe played football, so jane went shopping.
select one:
a. simple
b. compound
c. complex

we were afraid of being too late for the party.
select one:
a. simple
b. compound
c. complex

joe set up the tent, and sam made a fire.
select one:
a. simple
b. compound
c. complex

knowing our friends were disappointed, we were sorry to leave.
select one:
a. simple
b. compound
c. complex

jon and tom went to college for a degree in engineering, but they graduated in computer science.
select one:
a. simple
b. compound
c. complex

the four friends bought a tub of hot, buttered popcorn to share at the movies.
select one:
a. simple
b. compound
c. complex