Select the option that is related to the third letter-cluster in the same way…

Each letter of the first cluster in this kind of analogy is moved a fixed number of places along the alphabet — forward for a positive shift, backward for a negative one, wrapping from Z back to A — to give the matching letter of the second cluster. Reading those four position-wise shifts off the given pair and applying the very same shifts, in the same order, to the third cluster produces the answer.

Reading the shifts from RIDE : YDGD, position by position:

1. R moves forward to Y — a shift of +7.

2. I moves backward to D — a shift of −5.

3. D moves forward to G — a shift of +3.

4. E moves backward to D — a shift of −1.

Applying these same four shifts, in the same order, to H, E, L, P:

1. H shifted +7 gives O.

2. E shifted −5 wraps past A and gives Z.

3. L shifted +3 gives O.

4. P shifted −1 gives O.

So HELP relates to the same shift pattern by becoming OZOO.

Cross-check: repeating the same four shifts using the alphabet numbered from A = 0 instead of A = 1 gives the identical letters at every position, confirming the pattern and the result.