In the context of water bodies, Neap Tides occur:

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1. Definition: Neap tides occur when the gravitational effects of the Sun and Moon partially cancel each other, producing a smaller tidal range.

2. Geometry: This happens when the Sun and Moon are at right angles relative to the Earth — i.e., the angle between their pull is $90^\circ$.

3. Consequence: Because the forces are perpendicular, high tides are lower and low tides are higher than average.

4. Occurrence: Neap tides coincide with the Moon's first and third quarter phases.

5. Option check:
   - (1) Earth, Moon and Sun in a straight line → spring tides (largest range), so incorrect.
   - (2) Sun and Moon on opposite sides → also an alignment case (spring tide), so incorrect.
   - (3) Continental interference affects local tides but does not define neap tides, so incorrect.
   - (4) Sun and Moon at right angles → correct (neap tides).

FINAL_ANSWER: d

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