What could be causing this error?

Refer to the exhibits.
Exhibit 1

Exhibit 2

PC1 cannot reach PC2. Based on the exhibits, what could be causing this error?
A. PC1 has the wrong IP address for its default gateway setting.
B. Router A has a direct route, instead of a static route, to 10.1.10.0/24.
C. The next hop address for the 10.1.20.0/24 route is incorrect.
D. Router A has an invalid subnet mask for the VLAN 1 subnet.

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