Answer:
correct option is B
1988
Explanation:
we know that the code of conduct announce by 34th U.S. President ( Dwight D. Eisenhower ) on 17 august 1955
it is modify two times
one is in 1977
and 2nd in 1988
so president Ronald Reagan Order 12633 issued amending the Code of Conduct to use neutral-gender in march 1988
and it is first written show in 1955
so here correct option is B
in 1988