Why do every time i try to answer a question says a erro has occoured

Which of the following had the greatest influence on opening the internet to the generly public

What are three software programs for mobile computing?

You wanted to look up information about alzheimer's, but you were unsure if it was spelled "alsheimer's" or "alzheimer's." which advanced search strategy would be useful? a) a boolean search b) using a wild card in your search c) trying different search engines d) doing a search for "alsheimer's not alzheimer's" asap. ill give brainlist.