Suppose that {an} is an arithmetic sequence with a_1 \plus{} a_2 \plus{} \cdots \plus{} a_{100} \equal{} 100 \text{and} a_{101} \plus{} a_{102} \plus{} \cdots \plus{} a_{200} \equal{} 200. What is the value of a_2 \minus{} a_1?<spanclass=′latex−bold′>(A)</span>0.0001<spanclass=′latex−bold′>(B)</span>0.001<spanclass=′latex−bold′>(C)</span>0.01<spanclass=′latex−bold′>(D)</span>0.1<spanclass=′latex−bold′>(E)</span>1