Based on certain typing results, what is the most probable racial ethnicity of a donor with Le(a-b-), Fy(a-b-), and Js(a+b+)?

The typing results of Le(a-b-), Fy(a-b-), and Js(a+b+) provide significant insights into the probable racial ethnicity of the donor.

The Le(a-b-) phenotype indicates the absence of both Lea and Leb antigens. This phenotype is relatively rare and has a higher frequency in certain populations. Similarly, the Fy(a-b-) phenotype represents a lack of the Duffy antigens, which is also more common among African Americans. Notably, the Js(a+b+) phenotype implies the presence of the Jk(a+) and the absence of Jk(b-), which tends to be found across various ethnicities, but in the context of the other two phenotypes, can also lean towards higher occurrence in individuals of African descent.

In summary, the combination of Le(a-b-), Fy(a-b-), and Js(a+b+) is most characteristic of individuals of African American descent, making this the correct answer.