Question

obligated has the same or almost the same meaning as:
obstinate
duty - bound
open - and - shut
regulated

Explanation:

"Obligated" means having a moral or legal duty to do something. "Duty - bound" also implies being under a duty or obligation. "Obstinate" means stubborn, "open - and - shut" refers to something straightforward, and "regulated" means controlled by rules.

Answer:

B. duty bound