Which sentence has no errors in the use of quotation marks or italics?

a.
this time he was aboard "discovery," whose crew was in space for nine days.

b.
in 1962, astronaut john glenn piloted friendship 7, the first manned u. s. spacecraft to orbit the earth.

c.
in 1998, thirty-six years after the five-hour friendship 7 flight, john glenn returned to space.

d.
on september 29, 1988, the redesigned shuttle spacecraft "discovery" was launched.