please help with the Astronomy question 1-7 and explain why, thank you
1.. Mercury's magnetic field is very weak, because it:
A. Does not have a conductive layer B. Does not have a fluid layer
C. Rotates slowly D. Revolves quickly
2. Does not have water at its poles:
A. Mercury B. Venus
C. Earth's moon D. Mars
3. Least likely explanation for Venus's slow, backward rotation:
A. Always rotated that way B. Atmospheric drag
C. Collision with another planet D. Once closer to the sun and tidally locked
4. Had plate tectonics in the past:
A. Mercury B. Venus
C. Mars D. Ganymede
E. Callisto
5. Responsible for Venus's runaway greenhouse effect:
A. Carbon dioxide B. Chlorofluorocarbons (CFCs)
C. Methane D. Nitrous oxide
E. Water vapor
6. Mars's surface is redder than the other terrestrial worlds, not for this reason:
A. Mars's size B. Mars's distance from the sun
C. Incomplete differentiation D. Mars's higher iron content
7. Youngest surface feature on Mars:
A. Hellas Basin B. Inter-crater plains
C. Northern lowlands D. Southern highlands