Assertion (A) : Basalt is a fine grained and dark coloured igneous rock which is formed below the earth's surface.Reason (R) : THe rate of cooling and solidification of magma inside the earth is very slowCode

• A. Both (A) and (R) are true and (R) is the correct explanation of (A)
• B. Both (A) and (R) are true but (R) is not a correct explanation of (A)
• C. (A) is true but (R) is false
• D. (A) is false but (R) is true