Answer:C. Articles I and III aim to limit the construction of missiles.
Explanation: Article I of the Interim Agreement states that the Parties undertake not to start the construction of additional fixed land-based intercontinental ballistic missile (ICBM) launchers after July 1, 1972. Meanwhile, Article III states that the Parties undertake to limit submarine-launched ballistic missile (SLBM) launchers and modern ballistic missile submarines to the numbers operational and under construction on the date of signature of this Interim Agreement, and in addition to launchers and submarines constructed under procedures established by the Parties as replacements for an equal number of ICBM launchers of older types deployed prior to 1964 or for launchers on older submarines. Therefore, Articles I and III of the Interim Agreement aim to limit the construction of missiles in order to mitigate the threat of nuclear proliferation.