If `m_(A)` gram of a metal A displaces `m_(B)` gram of another metal B from its salt solution and if the equilvalent mass are `E_(A) and E_(B)` respectively then equivalent mass of A can be expressed as:
A. `E_(A)=(m_(A))/(m_(B)) xx E_(B)`
B. `E_(A)=(m_(A) xx m_(B))/(E_(B)`
C. `E_(A)= (m_(B))/(E_(A)) xx E_(B) `
D. `E_(A)= sqrt((m_(A))/(m_(B)) xx E_(B) )`