I need help with these problems !!! please provide some detail explanation. Thank you so much!!!

Sprawl is an example of market failure when: A. The elasticity of urban land growth with respect to commuting cost is zero. B. it can be shown that the extent of the city is associated with a specific cause or causes of market failure, such as externalities. C. The elasticity of urban land growth with respect to population is greater than one. D. it can be shown that the growth of the city is associated with less dense devetopment. According to Brueckner some people choose homelessness because A. They come from disadvantaged backgrounds B. Homelessness is the most preferred consumption choice give the constraint that they face for some consumers C. They prefer a \"free\" lifestyle D. None of the other alternatives In the Brueckner model of freeway congestion, generally A. Zero congestion is optimal B. A positive level of congestion is optimal C. The Brueckner model does not address congestion According to Brueckner, the optimal level of congestion is: A. Positive but not determined by the free market. 0 B. Determined by the free market. C. Can only be determined by a voting mechanism. D. Zero. An important factor determining the extent of unsheltered homelessness is: A. The state Gross Domestic Product 0 B. None of the other alternatives mentioned 0. The unemployment level D. Average outdoor temperatures