Me choose the one with proper subject-verb agreement. question 13 options: in regions of the world where poverty prevails, starvation and poor hygiene lead to disease. open and honest communication contribute to a happy relationship. the president or the vice president are speaking today. the purpose of this essay is to investigate how the design of toothbrushes have changed over time.

The corrected sentence is: “In regions of the world where poverty prevails, starvation and poor hygiene lead to disease.” If the subject consists on two or more item joined by “and”, the verb is in the plural.

In the second sentence, the verb “contributes” is written in the singular form as it modifies the singular noun “communication. The third sentence is incorrect because the subject consists on two or more items joined by “or”. Consequently,the verb  is in the singular form because the last item (vice president ) is a singular noun. Finally, in the last sentence the verb “have” is incorrect as it modifies a singular noun (design).  It should be "has".

is this your complete question

breathe, think and analyze the situation, pull them aside and talk to them about it