Step 1: Look at the four words placed one below another.
BPJE, BQDH, BRCF, BSBD - write them in a column and compare letter by letter instead of reading each word as a whole.
Step 2: Track the first two letters separately.
The first letter stays fixed at B every time, and the second letter climbs one step up the alphabet each time - P, Q, R, S - so the next one has to be T.
Step 3: Track the last two letters as a falling pair.
The third letter drops sharply and then keeps sliding back by one each time - J, D, C, B - so it lands on A next, and the fourth letter follows the same falling habit - E, H, F, D - stepping down to B.
Step 4: Put the four pieces back together.
B, T, A, B combine to give the missing term.
\[ \boxed{BTAB} \]