If a magma moves upward in one stage only, stops, and crystallizes below the surface it will

Answer 1

Brandon L answered well. That's a classic description of a magma that would cool in one stage to form an intrusive igneous rock body most likely with a phaneritic texture (coarse-grained, interlocking crystals, similar in size). Because it moved up in only one stage (meaning it went from migrating upward as fully liquid and then cooled in place after migration), the resulting rock would not likely have any significant porphyritic texture, which forms in a multi-stage migration... the magma migrates up, stops at some depth and cools a bit forming some large crystals, then the magma migrates upward again and cools the rest of the way at a shallower depth (where it can cool more rapidly), preserving the large phenocrysts in a groundmass of smaller crystals.

So strictly, a more complete answer to this question (if it is posed as a "Fill in the end of the sentence" type questions) might be: "... likely form an intrusive, phaneritic igneous rock with little or no porphyritic texture."

Answer 2

...form an intrusive rock. Depending on the composition of the magma (which includes melt, crystals, and volatile gasses), the intrusive rock could be a pluton (if felsic to intermediate) or some sort of sill (generally for mafic).

Depending on the depth of intrusion and rate of cooling (and composition), the resulting rock that is formed may be coarse grained with lots of interlocking crystals. An example of a rock formed by the process described is a granite (think like your countertop before it is cut and slabbed into "dimension-stone").