GCEGeographyRocks and Landforms2019

Which of the following statements correctly distinguishes concordant from discordant igneous intrusions?

AConcordant intrusions cut across existing rock strata, while discordant intrusions run parallel to them
BConcordant intrusions run parallel to existing rock strata, while discordant intrusions cut across themCORRECT
CConcordant intrusions are always formed at the Earth's surface, while discordant intrusions are formed underground
DConcordant intrusions are composed of basalt, while discordant intrusions are composed of granite
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Why the answer is B, and why the others tempt you.
Concordant intrusions, such as sills and laccoliths, are emplaced parallel to the existing bedding planes or rock strata. Discordant intrusions, such as dykes and batholiths, cut across the existing rock strata at an angle. The distinction is based entirely on the geometric relationship between the intrusion and the surrounding country rock, not on composition or location.
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