When considering the use of laterite soil as a replacement for sand in NSC and HSC within once civil engineering, which statement is accurate?
a. The inclusion of laterite soil leads to a decrease in the density of NSC but has no effect on HSC
b. Laterite soil enhances the freezethaw resistance of NSC but not HSC
c. Substituting sand with laterite soil in NSC and HSC results in increased workability and decreased setting time.
d. Incorporating laterite soil as a partial replacement for sand improves the flexural strength of both NSC and HSC