Step 1: mKisan is ICAR's own SMS service, matching (A) to (I).
Step 2: mkrishi runs over BSNL's network, matching (B) to (II).
Step 3: Digital Mandi is a Department of Agriculture and Cooperation initiative, item (IV); Kisan Suvidha app is a TCS product, item (III).
\[ \boxed{\text{(A)-(I), (B)-(II), (C)-(IV), (D)-(III), Option (3)}} \]