You can further understand a text if you ask questions.
Everything is made of protons, neutrons, and electrons but not sodium :)
Barometric pressure decrease indicates coming stormy weather, rain, wind, , heat. Barometric pressure rise indicates fair, dry, colder weather. Slow, regular and moderate fall in pressure indicates low pressure area is passing at a distance. So, A.
The third trimester begins at B) seven months.
The first trimester: 1-3
The second trimester: 4-6
The third trimester: 7-9.