The correct answer is option 1 i.e. increase.After reading the sentence we can easily comprehend that recent measures have been taken in order to improve the output, now we can ask ourselves how can we increase output? and then let's go through each option one by one.Here "would' is a modal so the word in the blank must be in base form (V1). It is quite obvious that to increase the output we must increase production(output and production are directly proportional) hence, 'decrease' 'speed' and 'equalise' are inappropriate choices.Complete Sentence: The recent measures to improve the output would increase the level of production to our satisfaction.