In the last paragraph, the word "designated" is closest in meaning to ______.

A．omit all the irrelevant information
B．find pages containing all the words or phrases in the search string
C．give you only very limited information
D．sometimes find no hits

A．how to reduce the number of hits
B．how to find videos of humpback whales in the North Atlantic
C．the importance of maths in building a search string
D．how to use search engines on the Web more efficiently