Correct Answer - Option 4 : s q s r t
According to the given information we have to check the options one by one :
Option 1) R S Q T R R Q S T Q T S S S Q
Option 2) R S R T R R S S T Q T S S Q Q
Option 3) R S T T R R T S T Q S S S R Q
Option 4) R S S T Q R S S T Q R S S T Q
Here, option (4) is giving a pattern of RSSTQRSSTQRSSTQ.
No other option is giving any particular pattern.
Hence, the correct answer is "s q s r t".