Change the following from active to passive:
People can seldom access archived manuscripts without clearance.

Correct option is C

The correct active/passive voice of the given sentence is (c).
To convert Active → Passive with a modal verb ( can), we keep the modal and change the main verb into “be + V3” form.
Active: People can seldom access archived manuscripts…
Passive: Archived manuscripts can seldom be accessed…
Structure:
Active voice: Subject + Modal + Adverb + V1 + Object
· People + can + seldom + access + archived manuscripts
Passive voice: Object + Modal + Adverb + be + V3 + (by + subject)
· Archived manuscripts + can + seldom + be accessed + (by people)
Explain why other options are incorrect:
· (a) “can seldom being accessed”
· After modal can, we must use be + V3, not being.
· Wrong structure: can + being + V3 is incorrect.
· (b) “could”
· Changes the meaning (can ≠ could). The tense/modality is altered unnecessarily.
· (d) “are seldom able to be accessed”
· Grammatically possible, but it changes style/meaning and is not the standard passive conversion of can access. The question expects the direct passive with can be accessed.
Information booster:
Modal verbs in passive follow this fixed pattern:
Modal + be + V3
Examples:
· can do → can be done
· must follow → must be followed
· should complete → should be completed