Correct option is C
Option (c) BDEC is the correct order of the given sentences.
· B logically follows A because it introduces the subject of the second hour, which is Arithmetic.
· D follows B as it describes the entrance of Vedanayagam as the Arithmetic teacher.
· E comes after D since it elaborates on how Vedanayagam taught, specifically mentioning his monotonous droning.
· C follows E because Swaminathan’s boredom is a direct reaction to the monotonous teaching described in the previous sentence.
This sequence ensures that the paragraph flows logically, with each sentence building upon the previous one.