Correct option is B
Given:
Statement 1: Some locks are keys
Statement 2: All keys are doors.
From the given statements possible Venn diagram will be.
Now, we check each options.
Option (a): All doors are keys.
False, the statement says all keys are doors, but it does not say that all doors are keys.
Option (b): Some locks are doors.
True, since some locks are keys and all keys are doors, it logically follows that those locks that are keys must also be doors.
Option (c): All locks are doors.
False, no some locks are doors as shown in diagram.
Option (d): No lock is door.
False, some locks is door as shown in diagram.
Thus, correct option is (b).
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