Find out the missing term in the series:

Break each term down into its three constituent components (First Letter, Number, Last Letter):

1. First Letter Sequence:
   $$\text{D (4)} \xrightarrow{+3} \text{G (7)} \xrightarrow{+3} \text{J (10)} \xrightarrow{+3} \mathbf{M (13)} \xrightarrow{+3} \text{P (16)}$$
   The first letter advances by $+3$ positions in the alphabet, giving M.

2. Numeric Sequence:
   $$8 \xrightarrow{\times 2} 16 \xrightarrow{\times 2} 32 \xrightarrow{\times 2} \mathbf{64} \xrightarrow{\times 2} 128$$
   Each number is doubled (multiplied by $2$), giving 64.

3. Last Letter Sequence:
   $$\text{T (20)} \xrightarrow{-4} \text{P (16)} \xrightarrow{-4} \text{L (12)} \xrightarrow{-4} \mathbf{H (8)} \xrightarrow{-4} \text{D (4)}$$
   The last letter decreases by $-4$ positions in the alphabet, giving H.

Combining all three elements yields the missing term: M64H.

Thus, the correct option is A.