Answer:
I'd say it's either A) "Because of her work, she spent a lot of time looking for specimens", or D, “Then Mina led her uncle down the street to the store, where she greeted the shopkeeper.” Hope this helps! Marking as Brainliest would be highly appreciated! :)
Superlative adverbs are adverbs ending in -est. So think of big, bigger and biggest. Biggest is the superlative adverb due to the it ending in -est and having the 'superior' effect which is linked to its name of superlative.