For how many minutes would you need to cycle to use up the energy in 100g of chocolate??

the correct answer is (B) Whether others of the closely related group of plants also produce histidine in large quantities

Explanation:

This is a CAUSAL argument.

In a causal argument, A and B are observed together, and the CR concludes that A CAUSES B.

Premise = A and B are observed together:

A cultivated herb produces histidine and is able to grow in metal rich soils.

Conclusion = A causes B:

Histidine CAUSES the herb to be able to grow in metal rich soils.

One way to strengthen the conclusion that A causes B is give ANOTHER SUPPORTING EXAMPLE that links A to B.