Evaluations for input

Suppose you have trained an SVM classifier with a Gaussian kernel, and it learned the following decision boundary on the training set:<image 1>You suspect that the SVM is underfitting your dataset. Should you try increasing or decreasing C? Increasing or decreasing $\sigma^2$?

(A) It would be reasonable to try decreasing C. It would also be reasonable to try increasing $\sigma^2$.

(B) It would be reasonable to try decreasing C. It would also be reasonable to try decreasing $\sigma^2$.

(C) It would be reasonable to try increasing C. It would also be reasonable to try decreasing $\sigma^2$.

(D) It would be reasonable to try increasing C. It would also be reasonable to try increasing $\sigma^2$.

Answer with the option's letter from the given choices directly. No punctuation.