Question

what effect do the sun, moon, and earth have on the tides when all three are in alignment?
the suns gravity is balanced by the moon, eliminating all tides.
the suns gravity is balanced by the moon, so the tide is lower than normal.
the suns gravity is balanced by the moon, so the tide is lower than normal.
the combination of the gravitational pull of the sun and moon causes high tides to be higher and low tides to be lower.
the gravitational pull of the sun is strengthened, causing the tides of the earths hemisphere tilted toward the sun and moon to be much higher.

Explanation:

When the sun, moon, and Earth are in alignment (during a new - moon or full - moon), the combined gravitational pull of the sun and moon causes spring tides. Spring tides result in higher high tides and lower low tides compared to normal tides. The sun's and moon's gravitational forces work together, not balance each other out to eliminate or lower tides.

Answer:

The combination of the gravitational pull of the sun and moon causes high tides to be higher and low tides to be lower.