Q.

What is a top-down parser?

A. begins by hypothesizing a sentence (the symbol s) and successively predicting lower level constituents until individual preterminal symbols are written
B. begins by hypothesizing a sentence (the symbol s) and successively predicting upper level constituents until individual preterminal symbols are written
C. begins by hypothesizing lower level constituents and successively predicting a sentence (the symbol s)
D. begins by hypothesizing upper level constituents and successively predicting a sentence (the symbol s)
Answer» A. begins by hypothesizing a sentence (the symbol s) and successively predicting lower level constituents until individual preterminal symbols are written
Explanation: a top-down parser begins by hypothesizing a sentence (the symbol s) and successively predicting lower level constituents until individual preterminal symbols are written.
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