Contrast the two IP versions directly. IPv4 addresses are 32 bits, giving about $2^{32}$ addresses. IPv6 was created because that space ran out, so it widened the address to 128 bits:
\[ 2^{128} \approx 3.4 \times 10^{38} \text{ addresses} \]
That vast pool removes the need for NAT, IPsec is a native part of the design, and hosts can self-assign addresses through autoconfiguration. Those three options are genuine IPv6 traits.
Saying IPv6 uses 32-bit addressing describes IPv4, so it is the odd one out.
\[\boxed{\text{Uses 32-bit addressing}}\]