Concept:Identify the word whose stressed syllable falls in a different position compared to the other three words.
Explanation:Check the syllable that carries the main stress in each word.
For "challenger", the stress is on the first syllable: CHAL-len-ger.
For "solicit", the stress is on the second syllable: so-LI-cit.
For "umbrella", the stress is on the second syllable: um-BREL-la.
For "apprentice", the stress is on the second syllable: ap-PREN-tice.
Three words — solicit, umbrella, and apprentice — share the same stress pattern of second-syllable stress.
Only "challenger" breaks the pattern by placing its stress on the first syllable.
Answer:A. challenger