There is a seemingly authentic true story of the orphaned bear cub, which was obtained by Polish troops during World War II who walk with them through Iraq, Syria, Palestine, Egypt, Italy and Scotland. 1- Unbelievable, found, travelled 2- Unimaginable, discovered, wandered 3- Implausible, sustained, carried

The word 'obtained'(means 'recovered') and 'walked' do not fit contextually in the given sentence. Moreover, the sentence talks about an incident of past so use of present tense is incorrect in the sentence. Choice 1 i.e. 'unbelievable', 'found' and 'travelled' fit in the sentence both contextually and grammatically. Choice 2 i.e. 'unimaginable' (means 'which cannot be imagined'), 'discovered' and 'wandered' fit in the sentence both contextually and grammatically. In choice 3 use of 'carried' is incorrect as it does not fit meaningfully in the sentence. Hence, the answer is option d).