Read the following article and answer the question by choosing from the options.

It made me think of my mom and miss her a lot ... she loves cactus gardens . Rafa and I spent the rest of the day at the beach . Friday night , I have to say , was the highlight of my time in Rio . Sure the beaches are nice , the city is funky , and the views are spectacular ... but there is something else that Rio is known for that I had not yet experienced .

What is the narrator presently nostalgic for ?
Available options: a). They are nostalgic for the time they farmed cactus in the desert .; b). None of the above choices .; c). They are nostalgic for Rio .; d). They are nostalgic for their parents .;...A:
d).