What would be the major product of the following reaction? a. r)-3-ethyl-5-methylheptane

What would be the major product of the following reaction?
a. r)-3-ethyl-5-methylheptane
b. (r,s)-3-ethyl-5-methylheptane
c. (s)-3-ethyl-5-methylheptane
d. (3r,5s)-5-ethyl-3-methylheptane