Although many teenagers still visit movie theaters,
some economically conscientious parents remind their kids that monthly in-home streaming video services subscribing cost about the same as a movie ticket.A. some economically conscientious parents remind their kids that monthly in-home streaming video services subscribing cost about the same as a movie ticket. -> "Subscribing cost" is incorrect. We need to use "subscription cost" another error, we need to compare "in-home streaming video subscription cost" to "movie ticket cost"
B. some economically conscientious parents remind them that subscribing to a monthly in-home streaming video service costs about the same as a movie ticket.-> The biggest issue here is "them". Parents need to refer to "their kids. Another issue, we need to compare "in-home streaming video subscription cost" to "movie ticket cost"
C. some economically conscientious parents remind their kids that a monthly in-home streaming video service subscription costs about the same as movie tickets.->we need to compare "in-home streaming video subscription cost" to "movie ticket cost"
D. some economically conscientious parents remind their kids that a monthly in-home streaming video service subscription costs about the same as a movie ticket does-> Comparison issue is resolved. And, there is no further error introduced. Let's keep it.
E. some economically conscious parents remind their kids that monthly in-home streaming video services costs about the same as movie tickets do. -> "in-home streaming video services costs" is incorrect. We need "subscription".
So, I think D.