In a you are trying to find what others have prepared. with you are trying to discover new patterns that may not be obvious or known.
a. query; web mining
b. query; data mining
c. search; text mining
d. search: reporting

query, data mining

Explanation:

A query can be explained as another term for question.

If one needs additional information from some other person, he might have ask to him. Queries are used for the retrieval of the information.

In other words, one tries to find what have been prepared by others.

Data mining can be explained as the process that allows to sort through a large set of data for the identification of patterns.

In this process of data mining, one tries to find out the new patterns that may not be known at all.