The correct answer would be option D, New social ties and a meaningful experience.
Two reasons that volunteering may affect blood pressure are New social ties and a meaningful experience.
Explanation:
When someone offers to do something free of cost or without any payment, it is said to be a volunteer act. Volunteering is basically to work for someone or some organization without being paid.
Volunteering can be done due to many factors like to gain experience of the practical field, to satisfy the internal emotions, etc.
Volunteering also brings about some stress, and this stress may cause blood pressure. This increased blood pressure might be due to the stress caused by new social ties and a meaningful experience. Both factors might contribute in stress development which lead to high blood pressures usually.
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