Total lunar eclipses always occur
1. during either equinox.
2. during either solstice.
3. at the time of full moon.
4. at the time that the sun is directly over-head.
5. at the time of new moon.

3) At the time of a full moon

Explanation:

Lunar nodes are the locations where the Moon crosses the Earth's orbital plane. Total lunar eclipses happen only when: It is Full Moon. At the same time, the Moon is at (or very near) a lunar node, so the Sun, the Moon, and the Earth are aligned in a straight (or nearly straight) line.

Hope this helps!

Please mark brainliest!

c. would be the answer : )

explanation:

surface modification is a versatile tool and has been widely used in material science and engineering that has significantly facilitated the study and characterization of complex materials. at  matexcel, experienced experts in surface science can offer tailored efforts to meet the specific needs from our clients.