Which transition word best connects the ideas in this paragraph?

noise pollution is already a problem for those who live near central city airport. people tell me that they can't even talk to their neighbors on the street or in their yards. our children's education is being impacted. instruction is seriously hampered by the ear-splitting din of jets taking off and landing.
a. for instance
b. furthermore
c. however
d. consequently

The second point in the paragraph about children provides more support for the overall topic: noise pollution. because it's offering more evidence that noise pollution is an issue, "furthermore" is your best choice as a transition. "for instance" would suggest that you're giving an example of something, as in a specific case in which a child's education suffered. "however" suggests a shift, usually describing an exception, and the point of the children's education is not an exception--it's further evidence. "consequently" suggests that you'd carry on to tell the reader about an effect of a circumstance.