Which group of statements best describes all of the same materials he is using in the investigation

A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas.  

Which group of statements best describe all of the materials he is using in the investigation?

A) They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter.

B) They are each made of matter. Some are compounds and some are elements. They all contain atoms.

C) They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms.

D) They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

Answer D) is correct

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

the actual answer was 160934