Final answer:
In Indus Valley cities, the monumental ceremonial center was most likely a citadel, serving as the central hub for activities and administration.
Step-by-step explanation:
The question 'What may have served as the monumental ceremonial center in Indus valley cities?' refers to the most significant and central part of ancient urban settlements in the Indus Valley civilization. Among the options given, the correct answer is c. a citadel, which typically refers to a fortified center that often includes, or is adjacent to, the central administrative and ritual buildings of a city.
This term stands out because other options such as 'a ziggurat' and 'a pyramid' are not characteristic of Indus Valley city architecture. Indus Valley cities like Harappa and Mohenjo-Daro are well-known for their sophisticated urban planning, which included advanced drainage systems, grid layouts, and importantly, citadels that served as central hubs for activities.
The shape that Ezekiel had a job on can be determined by analyzing the given options. From the given options, a circle (option a) is the shape that has a round shape and can represent a job or occupation. Therefore, the correct answer is a) Circle.