Avewhich of the following is a tax? i. a 1 percent special sales tax for funding local road construction. ii. a fee paid to the state for a license to practice as an attorney. iii. an income tax imposed by philadelphia on persons working within the city limits. iv. a special property assessment for installing a new water system in the taxpayer's neighborhood.

III. An income tax imposed by Philadelphia on persons working within the city limits.

Explanation:

A tax is the monetary obligation from a taxperson in favor of the federal, state, or municipal governement without a concrete return or destination.

on the second situation, the fee is colected based on the licesne there is a return which is, the abilitation of the attorney licence.

the first and fourth the imposition comes with an explicit destination; the road construction or the water system. Therefore are not taxes.

b. take periodic breaks and alternate between tasks.  

will increase work efficiency, and avoid health issues.