Answer: A
Correct answer: Four
Number the letters of HORIZON and their alphabet positions: H(8) O(15) R(18) I(9) Z(26) O(15) N(14). A pair qualifies when the count of letters between them in the word equals the count between them in the alphabet, and four pairs do. H and N have five letters between them in the word (O, R, I, Z, O) and five in the alphabet (I to M). R and the second O have two in the word (I, Z) and two in the alphabet (P, Q). R and N have three in the word (I, Z, O) and three in the alphabet (O, P, Q). And the second O and N are adjacent in both, with none between. Note that only H–N runs in the same direction in the word as in the alphabet, so a solver taught to count forward pairs alone would answer one.