But, a widow would qualify to receive the death benefit even if she wasn’t disabled. It’s a tricky question...
Good catch on the wording, and you're right that it's a tricky one. There are two different "death benefits" here.
The one-time $255 lump-sum death payment goes to a surviving spouse with no age or disability requirement.
The monthly widow's benefit the question asks about has age rules: 60 or older, or 50 to 59 if she's disabled. Her disability must have started within seven years of her husband's death.
A widow of any age can also get monthly benefits while she's caring for his child under 16, but that's a separate "mother's benefit," not the widow's benefit.
At 52, disabled and with no child in her care, she qualifies under the disabled-widow rule, which is why A is correct. D fails because a widow without a disability or a child in her care has to wait until 60 for monthly benefits.