I assume you meant to write convection for one of those answers. Convection is the way that heat is transferred through liquids and gases.
Answer:
A: Shift to the left
Explanation:
The reaction would try to use up the added heat by making more H 2 and Cl 2.
Less compassionate around the chocolate
The black lines in the Sun's spectrum are caused by gases on, or above, the Sun's surface that absorb some of the emitted light.