Final answer:
The National Party of South Africa implemented apartheid not to 'consolidate services where needed' but to control the black majority, maintain cheap labor, and enforce racial segregation.
Step-by-step explanation:
The reason that was NOT why South Africa's National Party implemented apartheid in 1948 is D to consolidate services where needed. Apartheid was a policy aimed at maintaining white supremacy by legislating racial segregation. The central pillars of apartheid were to control the black majority (A), to maintain a pool of cheap labor for industries like mining (B), and to separate people of different races (C), which included creating separate homelands for different ethnic groups and racially segregating residential areas and employment.
A key component of the apartheid regime was to enforce control and exploitation of non-white labor through a passbook system. The government falsely presented apartheid as a fair system that brought stability through separation, but in reality, it was a means to control the black majority and support the socioeconomic division that benefitted the white minority at the expense of nonwhites.