What does the field of thermodynamics relate to a-changes in nuclear reactions b- changes in energy in systems c changes in molecular structure d changes in atomic properties

B. Changes in energy in systems.

Explanation:

Thermodynamics is a branch of physics which deals with heat and temperature in relation to energy work radiation and characteristics of matter.

This field studies the causes of energy changes and the effects of energy changes to chemical and  physical systems.

Thermodynamics relates B) changes in energy in systems.

Thermodynamics is the part of material science that manages warmth and temperature, and their connection to energy, work, radiation, and properties of issue. The conduct of these amounts is administered by the four laws of thermodynamics which pass on a quantitative depiction utilizing quantifiable naturally visible physical amounts, yet might be clarified as far as tiny constituents by factual mechanics.

Thermodynamics applies to a wide assortment of subjects in science and building, particularly physical science, concoction designing and mechanical designing, yet in addition in fields as intricate as meteorology.

if you mean hydrogen and oxygen then water is the product