To solve this question, the user needs to know the grammar rule for conditional sentences. In this case, the sentence is in the second conditional form, which means it is discussing hypothetical or unlikely situations.
Each option represents a different verb tense. Let's go through each option and explain why it is right or wrong:
A. was: This option is grammatically incorrect. The second conditional form requires the use of the past simple tense of the verb "to be", which is "were".
B. am: This option is grammatically incorrect. The second conditional form requires the use of the past simple tense of the verb "to be", which is "were".
C. were: This option is correct. The second conditional form requires the use of the past simple tense of the verb "to be", which is "were". Additionally, the verb "would" is used to express the hypothetical action of waiting to invest.
D. would be: This option is grammatically incorrect. The second conditional form requires the use of the past simple tense of the verb "to be", which is "were".
Therefore, the correct answer is:
The Answer is: C. were