Determine Mr. Jenkins's 2018 filing status in each of the following independent cases.

a. Mr. Jenkins and Mrs. Jenkins were divorced on November 18. Mr. Jenkins has not remarried and has no dependent children.

b. Mr. Jenkins and the first Mrs. Jenkins were divorced on April 2. Mr. Jenkins remarried the second Mrs. Jenkins on December 15. He has no dependent children.

c. Mrs. Jenkins died on July 23. Mr. Jenkins has not remarried and has no dependent children.

d. Mrs. Jenkins died on October 1, 2016. Mr. Jenkins has not remarried and maintains a home for one dependent child.

e. Mrs. Jenkins died on May 30, 2017. Mr. Jenkins has not remarried and has no dependent children.

f. Mr. Jenkins and Mrs. Jenkins were divorced on May 30, 2015. Mr. Jenkins has not remarried and maintains a home for his two dependent children.