The correct option is C QSRP
The first two parts are a sequence of events, where one is an action and the other is the response.
The words 'if suddenly you throw...' will be followed by Q: 'and my hand goes up', because it states a reflexive reaction that will take place immediately after the action. Hence, Q comes first in the underlined sequence.
P does not follow the if-clause because it does not form a complete thought.
Hence, the part that comes first is Q, and not P.
Similarly, R and S do not follow the if-clause as it does not form a coherent meaning.
The part that follows Q is S, as the word 'it' refers to the reaction 'my hand goes up to protect myself'.
R follows S because the words 'instinctive action' further define 'it'.
Part P follows R as the words 'and not a result' link to the other parts that explain the reflex reaction.
This sequence is seen in option C, hence it is the correct option.
Since the other options begin with P, R and S, and it's been established that Q comes first, options A, B and D are incorrect.