Code for Consonant is it's place value, and code for vowels are given below
A ⇒ 1,
E ⇒ 2,
I ⇒ 3,
O ⇒ 4,
U ⇒ 5

Correct Option: B

Code for Consonant is it's place value, and code for vowels are given below
A ⇒ 1,
E ⇒ 2,
I ⇒ 3,
O ⇒ 4,
U ⇒ 5

Therefor
M ⇒ 13,
A ⇒ 1,
N ⇒ 14,
G ⇒ 7,
O ⇒ 4

So the code for MANGO is 1311474

Divide 5 letter word in 3 parts ,in first pair add +3 and in last pair subtract -2

Correct Option: B

From Question
M + 3 = P
O +3 = R
U + 0 = U
S -2 = Q
E -2 = C

In the same way Same way,
S +3 = V
H + 3 = K
I + 0 = I
F - 2 =D
T -2 = R

The second and third letters, fourth and fifth letters, sixth and seventh letters of the word mutually interchange positions to form the code.

Correct Option: B

For question it is clear that, the second and third letters, fourth and fifth letters, sixth and seventh letters of the word mutually interchange positions to form the code.

So
C ⇒ C

I ⇘ R

R ⇗ I

C ⇘ U

U ⇗ C

L ⇘ A

A ⇗ L

R ⇒ R

so the code for CIRCULAR is CRIUCALR

F L A T T E R
7 2 3 8 8 5 9
and
M O T H E R
4 6 8 1 5 9
therefore,
M A M M O T H
4 3 4 4 6 8 1

Correct Option: A

F L A T T E R
7 2 3 8 8 5 9
and
M O T H E R
4 6 8 1 5 9
therefore,
M A M M O T H
4 3 4 4 6 8 1

GRAPE = 2 7 3 5 4
FOUR = 1 6 8 7
So, G = 2, R = 7, A = 3, P = 5, E = 4,
F = 1, O = 6, U = 8,
R = 7
GROUP = 2 7 6 8 5

Correct Option: C

GRAPE = 2 7 3 5 4
FOUR = 1 6 8 7
So, G = 2, R = 7, A = 3, P = 5, E = 4,
F = 1, O = 6, U = 8,
R = 7
GROUP = 2 7 6 8 5