The class of antibody able to cross the placenta from mother to fetus is

Explanation

IgG is the smallest and most abundant immunoglobulin in plasma and the only one transported across the placenta, so it gives the fetus and the newborn several months of borrowed protection. IgA is the antibody of secretions, including breast milk, and protects mucous surfaces after birth. IgE mediates allergy and IgM is the large first antibody made in a primary response.