Concept:Stress pattern means which syllable in a word is pronounced with the most emphasis.
Explanation:Word A, "sinister", is stressed on the first syllable: SIN-is-ter.
Word B, "religion", is stressed on the second syllable: re-LI-gion.
Word C, "efficient", is stressed on the second syllable: ef-FI-cient.
Word D, "encourage", is stressed on the second syllable: en-COUR-age.
Therefore, the first word has a different stress pattern from the other three.
Answer:A. sinister