3. PART A: What is the central argument contained within paragraph 6? A. The danger of bacterial contamination from Earth could make it difficult to determine whether there is native life on Mars.
B. The 1967 Outer Space Treaty guarantees that Mars should not be terraformed in any way.
C. It is almost impossible that any life could survive on the surface of Mars.
D. Landers and rovers are routinely being sent to Mars in order to investigate if there is any native life on the surface of Mars.