Correct Option: C

obstacle (Noun) : a situation, an event, etc. that makes it difficult for you to do or achieve something
hurdle (Noun) : each of a series of upright frames that a person or horse jumps over in a race; a problem or difficulty that must be solved or dealt with before you can achieve something
throw (Noun) : the act of throwing something
opposition (Noun) : the act of strongly disagreeing with somebody or something, with the aim of preventing something from happening
suspicion (Noun) : a feeling that somebody has done something wrong, illegal or dishonest, even though you have no proof; a feeling that something is true or you
cannot trust somebody or something