Question

read the paragraph, then choose the word that best completes the sentence. the u.s. army corps of engineers (usace) has put forth an unusual recommendation: the agency suggests that all trees along more than 14,000 miles (22,530 kilometers) of national levees be chopped down. levees are specially designed to protect low - lying communities from floods. the usace is concerned about trees that grow within 15 feet (4.6 meters) of the levees. it is believed that tree roots could damage the structures. meanwhile, many civil engineers, environmentalists, and citizens have protested the instructions from usace to remove trees. they insist that trees pose little or no risk to levees. they say that trees actually help stabilize the soil surrounding the structures. the plan has been _______. a expanded b challenged c hastened d perfected

Explanation:

The text states that many civil engineers, environmentalists, and citizens have protested the USACE's instruction to remove trees, indicating opposition to the plan. "Challenged" means to question or oppose something, which fits the context as the plan has faced opposition.

Answer:

B. challenged