Answer:
a) Decrease LRAS 
b) Decrease LRAS 
c) Increase AD 
d) Increase AD 
Step-by-step explanation:
steel workers go on strike so less steel is produced : this will cause a decrease in the log run aggregate supply of steel in the economy 
A tornado destroys factories in Louisiana.: this will cause a decrease in the log run supply of factory products and by-products in the economy 
Consumer optimism increases.leads to an increase in the aggregate demand curve 
The stock market rallies to 52-week highs increasing consumer wealth. this will definitely lead to an increase in the aggregate demand curve because with more money to spend the demand curve will increase