Discussion
Assertion (A): A mortar should generally be weaker than the bricks it joins.
Reason (R): Cracking is better confined to the joints, which can be raked out and replaced.
Answer: A
Both are true and the reason gives the design logic: repointing a joint is straightforward whereas replacing cracked units is not, so the weaker material is placed where failure can be tolerated. A strong mortar in a weak wall moves the cracking into the bricks.
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