1. Distinguished architecture requires the expenditure of large sums of money, even if it is by no means certain that the expenditure of large sums of money produce distinguished architecture.
(A) even if it is by no means certain that the expenditure of large sums of money produce
(B) even if it is by no means certain that the expenditure of large sums of money will produce
(C) even though there is no certainty that the expenditure of money in large sums produces
(D) even though it is by no means certain that the expenditure of large sums of money produce
(E) though there is no certainty as to the expenditure of money in large sums producing
D
I think the answer should have future reference. So it should be B

A correct sentence should be like
X requires to spend lot of money, even though/ even if it is by no means certain that it will produce Y (in future)

(ie u r saying that even though there is no guarantee that it will produce, u do Z

How can it be “even though it is not certain that lot of money produces Y”
“produces” means its present ie now.

it is stating a fact which is valid at present also-> simple present.

Is the question correct?

Because out of the given options, I can go only with B and then it is also wrong for the point stated by Sudeep ...

the expenditure is a singular subject and required produces (i.e. A, C and D are immediately out) ... E doesn't make any sense...

The only difference between A and D is the word "though" repalces "if" .... so looks like "even though" is correct idiom here? I am confused as well ...