A spring tide:

A. has very high high tides and very low low tides

B. has moderate high and low tides.

C. occurs at a blue moon.

D. occurs at the vernal equinox.

E. has very little difference between high and low tides.

Option A

Explanation:

There are 2 types of tides, high and low tides.

During the spring tide, there is a difference between the high tide and low tide. When this happens, it is called spring tides.

In other words, it is defined as when great change in high tide and low tides. This analysis, makes option B and E wrong from the options above as there are no little or moderate high and low tides during spring tides.

The spring tides happens either when there is full moon or new moon, not on blue moon, which makes option C wrong.

Spring tides is when the high tides and low tides are at there greatest change, option A is the best, because during this period there is a very high tide and very low tide.

Spring tides happens at equinox not at vernal equinox.