Option C is the correct answer because the first and last sentence respectively describe that the narrator woke up at 4 o’clock, had tea and then they discussed the main topics and entered the examination hall. Option Q,R and P i.e Studying till 6 o’clock, getting ready by 7 o’clock and then finding friends at the Exam Centre is the most logical sequence. Thus, option C is the right answer to complete the paragraph.
Option A is incorrect because reaching the exam centre and finding friends, getting ready by 7 o’clock and studying till 6 o’clock, is not a logical sequence to complete the paragraph. Thus, option A is not the right answer.
Option B is incorrect because getting ready by 7 o’clock, reaching the exam centre and finding friends and studying till 6 o’clock, is not a logical sequence to complete the paragraph. Thus, option B is not the right answer.
Option D is incorrect because getting ready by 7 o’clock, studying till 6 o’clock and reaching the exam centre and finding friends, is not a logical sequence to complete the paragraph. Thus, option D is not the right answer.