Discussion
The topography and gravity field of Mars indicate that its crust is :
Answer: A
The crust of Mars is out of hydrostatic equilibrium.
Mars carries enormous loads that are not isostatically compensated, above all the Tharsis rise with Olympus Mons and the other giant volcanoes, which stand many kilometres high. Its gravity field shows large positive anomalies over them and its shape departs strongly from that expected for a rotating fluid body, which shows that a thick, strong lithosphere supports these loads.
The same data also show that the crust is not of uniform thickness: it is thick under the southern highlands and thin under the northern lowlands, the so-called crustal dichotomy. That rules out the last two options as well as hydrostatic equilibrium.
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