If the output elasticities of all inputs used by a firm are summed together, then the total :

b. will be equal to one if returns to scale are constant. .....................................

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I Will Go With " B " Option           

I think it's option B

Thanks

I choose option b ...............................................................................................................

The answer is : Option ( B ) 

1. If the output elasticities of all inputs used by a firm are summed together, then the total The correct answer was: b. will be equal to one if returns to scale are constant.. 

b,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,          ...........................................

(B)                 Thank You.

My answer is an option (B)

I will got with option B, Thank you for invitation

all of the above are correct