When is the best time of a month for a woman to conceive?​

That means that while it's ideal to have sex on the day you ovulate, you may also get pregnant if you do the deed a few days before ovulation. Viable sperm should still be in your fallopian tubes when that egg arrives

Explanation:

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers