The city of Montreal spends a large portion of its annual budget on the construction of tourist attractions such as amusement parks, even if it is by no means certain that the construction of tourist attractions increases revenue from tourism.
a)even if it is by no means certain that the construction of tourist attractions increases
It does not have a proper antecedent to refer tob)even if the city is by no means certain that the construction of tourist attractions will increase
Will increase talks about the future whereas the tense in the entire sentence is Simple Present. The city is already spending hence the IF...THEN clause needs to remain in the Simple Present.
c)even if there is no certainty that the construction of tourist attractions increases
CORRECT. IF +PRESENT+ THEN + PRESENT.
d)even though the city is by no means certain that the construction of tourist attractions increases
This option is redundant: by no means certain = not certain/ no certainty
e)though there is no certainty as to the construction of tourist attractions increasing
Increasing is in the Progressive tense which is incorrect in this context. "As to" wrong usage.