Step 1: Identify the literary reference.
The line "Nature without check with original energy" is from William Blake’s poem *The Marriage of Heaven and Hell*, where he describes the power and freedom of nature's energy.
Step 2: Analyze each option.
- (A) human beings: Incorrect. The poem does not describe nature in relation to humans in this context.
- (B) birds: Incorrect. While nature is often related to birds, this line refers to the broader concept of energy.
- (C) energy: Correct. The line speaks of nature’s original energy, referring to natural, unchecked forces.
- (D) spear: Incorrect. A spear does not fit in the context of this metaphor.
Step 3: Conclusion.
The correct word is "energy," which reflects the unchecked and natural power described in the poem.