Directions: Choose the appropriate term from the options provided to fill in the missing space and finish the letter sequence.

B, D, G, K, ?, R, Y, I

The correct option is P.

To solve this letter sequence, we can convert each letter into its numerical position in the standard 26-letter English alphabet:

• B = 2^nd position
• D = 4^th position
• G = 7^th position
• K = 11^th position
• ? = Missing letter
• R = 18^th position
• Y = 25^th position
• I = 9^th position (or 35^th position when wrapping past 26)

Next, let us calculate the difference between consecutive positions:

From B (2) to D (4):
$4-2=+2$
From D (4) to G (7):
$7-4=+3$
From G (7) to K (11):
$11-7=+4$

Notice that the value added at each step increases sequentially by 1 (+2, +3, +4, ...).

Following this pattern, the next value to add to K (11) must be $+5$:

$11+5=16$

The 16^th letter of the English alphabet is P.

Therefore, the appropriate term to fill in the missing space is P.