The rise in price AND increase in demand[size=18]
D it is
We need plural verb so it's between D and E
E makes "try" and "mine" disjunct while they should be an integral part of "to try to do X"
Paul, I thought it required a singular verb, because
'The rise................has convinced'
but looks like my understanding is wrong, can you tell me why this requires a plural verb.
We have two subjects here.
Whenever confused about the subject ask youself question for the verb for e.g here
what caused the miners to bla bla bla?
ans: the rise and the demand
2nd e.g consider a very basic sentence
Sun rises in the east
what rises in the east? ans---Sun so sun is the subject
Ram and Shyam went to the market.
who went to the market? ans: Ram and Shyam
I hope that helps