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.

original oratory is a competitive event in the national speech and debate association, stoa usa, national catholic forensic league, and other high school forensic competitions in which competitors deliver an original speech on a subject of their choosing, though the speech must be factual.racial discrimination refers to discrimination against individuals on the basis of their race. policies of racial segregation may formalize it, but it is also often exerted without being legalized and also it means facing injustice.

i believe that's the correct answer