Which line exprees fact then a opinion on becoming an inventor

this would be in the imperative mood. it is a category of verb forms that are used to express orders,instructions,commands or requests.

1)a

2 b

3 d

4 d or b

explanation:

one of the central themes of edward abbey's work has been his staunch opposition to the glen canyon dam on the colorado river that created lake powell, destroying stunning scenery and wildlife habitat, endangering many rare species of fish and animals, and also irreparably destroying many important archaeological sites which provided information about the early inhabitants of the united states.