In the following sentence, two words are printed in bold, labelled (

• A and (
• A expectations by providing complete immunity, thereby earning meager (
• B . These words may be contextually incorrect or inappropriate. Choose the correct pair of words from the given options that can replace the bold words to make the sentence grammatically correct and contextually meaningful. If the original words are correct, select "No replacement required". The lead researcher reported that the breakthrough vaccine had stagnated (
• B praise globally.