A or d. I feel like it leans more toward d, since it's about the architecture of the building.
Lee Friedlander's photographic series "The Little Screens" captured the period of time from 1961-1970 as television started to become more popular in American homes. He was able to show their importance, during a time when many people viewed them as unnecessary.
Answer:
Baking soda contains one ingredient, sodium bicarbonate. However, Baking powder contains sodium bicarbonate, monocalcium phosphate and either sodium acid pyrophosphate or sodium aluminum sulfate.