GMAT Sentence Correction (SC) | In the field of eugenics, geneticists have thoroughly

increasing modifies number and increasingly modifies impressive. I can't understand why the first one gives us wrong meaning. can you help explaining?

Can someone plz explain the complete sentence after placing "E" in the question stem. I d not seem to get the sentence.

In the field of eugenics, geneticists have thoroughly scrutinized the human genome and its ability to shape certain traits to select and pre-determine increasingly impressive number of physiological characteristics