Choose the missing term in the following alphanumeric series from the given alternatives:

2A11, 4D13, 12G17, ______, 240M31

Looking at the series: 2A11, 4D13, 12G17, ______, 240M31

The pattern has three components: number-letter-number

Analyzing the first numbers: 2, 4, 12, ?, 240

$2 \times 2 = 4$

$4 \times 3 = 12$

$12 \times 4 = 48$

$48 \times 5 = 240$

Each term is multiplied by consecutive integers (2, 3, 4, 5).

The missing first number is $48$.

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Analyzing the letters: A, D, G, ?, M

Letter positions in the alphabet:

A = 1st position

D = 4th position

G = 7th position

M = 13th position

The differences are: $4-1=3$, $7-4=3$, $13-7=6$

Following the pattern where differences increase: 3, 3, 3, 6

$7 + 3 = 10$

The 10th letter is J.

The missing letter is $J$.

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Analyzing the last numbers: 11, 13, 17, ?, 31

These are all prime numbers.

Checking their positions in the prime sequence:

11 is the 5th prime

13 is the 6th prime

17 is the 7th prime

31 is the 11th prime

The prime positions are: 5, 6, 7, ?, 11

Following the pattern with differences: +1, +1, +2, +2

$7 + 2 = 9$

The 9th prime number is 23.

The missing last number is $23$.

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The missing term is $48J23$.

Therefore, the answer is Option 4: 48J23.