According to the 'Use' section, point 3 states: 'We can use there for a number of people and things. e.g. There are one thousand students and 50 teachers in our school.' Option (c) directly matches this example.
Class 6 › English Grammar and Composition › Chapter 7: Introductory 'There' & 'It' › Topic: Understanding the use of 'there' for existence, events, and quantities
Aligned to the NCTB national curriculum.