'Q' will be the first part of the given sequence as the demonstrative pronoun 'this' refers to 'nice garden' mentioned in S1. 'S' will follow next as 'these balls' is used in connection to 'silver bells' mentioned in 'Q'. RP will make a pair together as both the sentences are giving the description of the garden. Hence, QSRP is the correct sequence. Thus, option (c) is correct.