I'll give you a question, please answer with step-by-step reasoning process.
He explained that the concept was corporeal and the student should be able to grasp it, but the student found the ideas what?\nOptions:\n- intangible\n- intangible\n- spiritual\n- insubstantial\n- incorporeal

intangible
Corporeal means relating to a persons body.

Corporeal is the opposite of spiritual.

Spiritual concepts are intangible.

But indicates the opposite of corporeal.

.

The answer is intangible