Hi !
a dependant clause = first one
includes a subject and a verb but cannot stand alone as a complete thought
a complex sentence = the third one
Because the monster jumped up without warning, the girl screamed
1 = compound
2 = simple
3= complex : an independent clause + a dependant one
4 = compound
hope I helped !
The answer is: [A]: simple.
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The sentence given:
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"<span>South Africa is the wealthiest and most powerful country of the region."
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is a simple sentence.</span>
Above-on top of something
below- under something
up- "going up"
down- "go down the street"