Carboxylic acids and derivatives — practice question

The diagram indicates that a carboxylic acid P can be made from X, Y or Z. Which row is the correct one?

• Aalcohol X is primary; the change in $M_r$ is greatest for Y to P
• Balcohol X is primary; the change in $M_r$ is greatest for Z to P
• Calcohol X is secondary; the change in $M_r$ is greatest for Y to P
• Dalcohol X is secondary; the change in $M_r$ is greatest for Z to P