Concept:Spring tides occur when Sun, Earth and Moon are in a straight line (syzygy), which greatly amplifies the combined gravitational pull.
Explanation:Spring tides need the gravitational forces of the Sun and Moon to work together.
This happens only when the three bodies are aligned in a straight line, called syzygy.
There are two such alignment types that produce spring tides.
SYZYGY Conjunction:The Moon lies directly between the Earth and the Sun.
The Sun and Moon pull on the same side of Earth, reinforcing each other.
This gives very high high-tides and very low low-tides.
SYZYGY Opposition:The Earth lies directly between the Sun and the Moon.
The Sun and Moon pull on opposite sides of Earth, but they still line up straight.
The combined effect again produces strong spring tides.
Quadrature:Here the Sun, Earth and Moon form a right angle (90°).
The gravitational pulls partially cancel each other, producing neap tides — the opposite of spring tides.
So quadrature is not suitable for spring tides.
Answer:Both SYZYGY Conjunction (1) and SYZYGY Opposition (2) are suitable for spring tides.
Correct code: C (1 and 2).