Spring Tide occurs:

Detailed Solution:

The correct answer is “ When the sun and moon are in a straight line”.

Spring tides occur when the sun, moon, and Earth are aligned, causing their combined gravitational pull to strengthen the Earth's water. This alignment happens during a new or full moon, when the moon is also closest to Earth, which is called perigee. The result is the highest and lowest tides, with the greatest difference between high and low tide.