Question

match each internal challenge to remaining diplomatic to the strategy to overcome it
managing emotional reactions
choose
choose
relax your back and shoulder muscles before a meeting
write down what you want to say in advance
adjust your facial expressions to match what you want to say
controlling physical reactions
choose

Explanation:

Managing emotional reactions: Adjust your facial expressions to match what you want to say. Facial expressions can influence and manage emotions.
Avoid careless verbal reactions: Write down what you want to say in advance. This helps in thinking through responses and avoiding hasty words.
Controlling physical reactions: Relax your back and shoulder muscles before a meeting. Physical relaxation techniques can control physical reactions.

Answer:

Managing emotional reactions - Adjust your facial expressions to match what you want to say.
Avoid careless verbal reactions - Write down what you want to say in advance.
Controlling physical reactions - Relax your back and shoulder muscles before a meeting.