Which of the following taxpayers may file as a head of household in 2018? marco provides all the support for his mother, sienna, who lives by herself in an apartment in fort lauderdale. marco pays the rent and other expenses for the apartment and properly claims his mother as a dependent. tammy provides over one-half the support for her 18-year old brother, dan. dan earned $4,200 in 2018 working at a fast food restaurant and is saving his money to attend college in 2019. dan lives in tammy's home. juan's wife left him late in december of 2017. no legal action was taken and juan has not heard from her in 2018. juan supported his 6-year-old son, who lived with him throughout 2018.a. marco onlyb. juan onlyc. tammy onlyd. marco and juan onlye. marco, tammy, and juan