The cells is the smallest functional and structural unit of all organisms.

This is true.  A cell is the smallest unit of living matter, the basic unit of life. In multicellular organisms such as man, cells make up every tissue, organ, and organ system in the body. Man is organized in cells, tissues, organs and organ systems.

Cells  work  together in groups known as tissues. A tissue, be it plant or animal tissue,  is defined as a group of similar cells working together to carry out a certain task.

Tissues in turn are grouped together to form organs and organs are organized to into organ systems to carry out specific functions in the body.

All these is possible because of the cell, the very basic unit from which all living matter is made.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .

you would need to check her bp before and after her activity.