A teacher has organized the following activities in the classroom. Which of the following activities is not an effective teaching-learning strategy to teach about Indian history?

a. A play depicting the Mughal empire.

b. An open-ended question session about the rule of Britishers.

c. Describe the timeline of the Indian Independence movement starting from the revolt of 1857.

d. Ask the students to conduct a survey regarding people's opinions about the most prominent event in the history of India's struggle for freedom.