are necessarily
continuous across S
Some lines of must be
discontinuous across S
Lines of 
are
necessarily continuous across S
Lines of cannot all be
continuous across S
Answer:
(a,d)The lines of
magnetic field induction 
are
necessarily continuous across the surface S of a lump of magnetic material.
Outside the lump of magnetic material, 
and
inside the lump of magnetic material, 
where
is the relative permeability of
material. Thus the lines of H cannot all be continuous across surface S.
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