The metabolic factor that you have the most control over is B. Activity level.
Answer:
By squeezing a bulb attached to the wide end of the pipette
Explanation:
You squeeze the bulb and place it on the wide end of the pipet. Then you place the tip of the pipet in the solution and release your grip to pull it into the pipet.
B is wrong, unless you want to accidentally get a mouthful of the sulfuric acid or cyanide you are pipetting.
C and D are wrong. Even the wide end of a pipette is too narrow to fill with either a beaker or an eyedropper.
Answer is A Golgi body.
The Golgi body or Golgi apparatus or dictyosome is a membrane bound sac like cell organelle found in most of the eukaryotic cells. The Golgi body plays very important role in processing the synthesized macromolecules such as protein and lipids in the cell. Actually this cell organelle modify, sort, and package proteins to be released outside the cell. For packaging and processing of protein, Golgi body works closely with rough endoplasmic reticulum.