In the following question, two statements and five connectors are given. Only one of the connectors from those given can be used to combine the given two statements into one sentence without changing the meaning. Choose that connector as your answer. 1. Nuclear medicine imaging runs almost entirely on Molybdenum-99, a radioisotope produced by nuclear fission of enriched uranium that decays so rapidly it becomes worthless within days. 2. Moly-99, as it's called, is created in just six government-owned nuclear research reactors, raising concerns about the reliability of the supply and even prompting federal scientists to warn of the possibility of severe shortages.

(c) The sentences share a contradictory relationship - 1 talks about how important molybdenum-99 is for nuclear medicine imaging. 2 tells us how its supply is very low. This is contradictory as one might suppose that something that is so important would be produced in a large supply. ALTHOUGH is used to link contradictory sentences and can be used here - "Although nuclear medicine imaging runs almost entirely on Molybdenum-99, a radioisotope produced by nuclear fission of enriched uranium that decays so rapidly it becomes worthless within days, moly-99, as it's called, is created in just six government-owned nuclear research reactors, raising concerns about the reliability of the supply and even prompting federal scientists to warn of the possibility of severe shortages." Thus, (c) is the right answer. SINCE and BECAUSE are used to show a causational relationship, which is not the case here IF is used to show conditionality or to show dependence between two clauses, which is not the case here. WHEREAS is used to show a contrast between two things, which is not the case here.