I believe the answer is: emotional stability
Identical twin would have similar characteristic in traits that influenced by Genetics, and genetics are much more likely to influence biological outcome rather than psychological.
From the options above, option A, B, D are considered as personality traits (psychological) while emotional stability usually affected by hormones (biological)
        
             
        
        
        
Answer:
Annual depreciation = $44,400
Explanation:
Given,
Purchase price of the delivery van = $111,000
Salvage value = $11,400
Useful Life = 5 years
We know that 
annual depreciation under double declining balance (%) = (100%/useful life)*2
Putting the value in the formula, Annual depreciation (%) =   (100%/5)*2
                                                                                                = 40%
Annual depreciation = Purchase Price*Percentage of annual depreciation 
Annual depreciation = $111,000*40% = $44,400
 
        
             
        
        
        
Answer:
A. wastefulness - production inside PPC ; B. Economy growth - PPC shift outwards/rightwards ; C. Economy at Productive Efficiency - production on PPC ; D. Unattainable Production- Outside PPC 
Explanation:
PPC is graphical representation of production combinations that an economy can produce, given resources & technology. 
PPC is based on assumption : That resources are best efficiently utilised. So, all product combinations ON PPC reflect 'Economy is at Productive Efficiency'
All production points INSIDE PPC reflect inefficient utilisation of resources i.e 'Wastage'
Points OUTSIDE PPC are 'Unattainable Product Combinations'- as they are beyond economy's best optimum production, given resources & technology. 
'Economic growth' is increase in resources &/or technology which increases economy's production potential and PPC curve SHIFTS rightwards or outwards.  
 
        
             
        
        
        
Answer:
an act of breaking the terms set out in a contract.