question_answer

Which one of the following statements is correct?

i. Obsidian is an igneous rock.

ii. Granite is a sedimentary rock.

iii. Conglomerate is a metamorphic rock.

iv. Gneiss is a metamorphic rock.

A) i, ii and iii         

B) ii and iii

C) i and iv 

D)        ii, iii and iv

E)  None of these